読者です 読者をやめる 読者になる 読者になる

プログラマでありたい

おっさんになっても、プログラマでありつづけたい

Amazonの在庫数とランキングの関係

 以前、「Amazonのランキングの不思議」ということで、順位付けのアルゴリズムを分析している本の紹介をしました。最近、拙著「Rubyによるクローラー開発技法」が、在庫20冊以下になり残数が表示されるようになりました。そこで、順位と在庫数を15分おきに取得して、その関係を見てみました。

生データ



 生のデータを、そのまま置きます。興味がある人は、考察してください。
データの収集には、KimonoLabsを利用しています。使い方は、こちらを見てください。

Version Date 順位 在庫 増減
2 Fri Jan 09 2015 22:25:40 GMT+0000 (UTC) 3657 16
3 Fri Jan 09 2015 22:42:26 GMT+0000 (UTC) 3763 16
4 Fri Jan 09 2015 22:58:40 GMT+0000 (UTC) 3763 17 1
5 Fri Jan 09 2015 23:14:45 GMT+0000 (UTC) 3763 17
6 Fri Jan 09 2015 23:30:43 GMT+0000 (UTC) 3888 17
7 Fri Jan 09 2015 23:46:42 GMT+0000 (UTC) 3888 17
8 Sat Jan 10 2015 00:02:55 GMT+0000 (UTC) 3888 17
9 Sat Jan 10 2015 00:18:50 GMT+0000 (UTC) 3888 17
10 Sat Jan 10 2015 00:35:19 GMT+0000 (UTC) 4118 17
11 Sat Jan 10 2015 00:51:38 GMT+0000 (UTC) 4118 17
12 Sat Jan 10 2015 01:07:24 GMT+0000 (UTC) 4118 17
13 Sat Jan 10 2015 01:23:33 GMT+0000 (UTC) 4118 17
14 Sat Jan 10 2015 01:39:34 GMT+0000 (UTC) 4474 17
15 Sat Jan 10 2015 01:55:31 GMT+0000 (UTC) 4474 17
16 Sat Jan 10 2015 02:11:40 GMT+0000 (UTC) 4474 17
17 Sat Jan 10 2015 02:27:57 GMT+0000 (UTC) 4943 17
18 Sat Jan 10 2015 02:44:21 GMT+0000 (UTC) 4943 17
19 Sat Jan 10 2015 03:00:33 GMT+0000 (UTC) 4943 17
20 Sat Jan 10 2015 03:15:48 GMT+0000 (UTC) 4943 17
21 Sat Jan 10 2015 03:31:45 GMT+0000 (UTC) 5574 17
22 Sat Jan 10 2015 03:48:01 GMT+0000 (UTC) 5574 17
23 Sat Jan 10 2015 04:04:00 GMT+0000 (UTC) 5574 17
24 Sat Jan 10 2015 04:19:48 GMT+0000 (UTC) 5574 17
25 Sat Jan 10 2015 04:35:55 GMT+0000 (UTC) 6262 17
26 Sat Jan 10 2015 04:52:17 GMT+0000 (UTC) 6262 17
27 Sat Jan 10 2015 05:08:22 GMT+0000 (UTC) 6262 17
28 Sat Jan 10 2015 05:24:27 GMT+0000 (UTC) 6262 17
29 Sat Jan 10 2015 05:40:43 GMT+0000 (UTC) 6968 17
30 Sat Jan 10 2015 05:56:21 GMT+0000 (UTC) 6968 16 -1
31 Sat Jan 10 2015 06:12:35 GMT+0000 (UTC) 6968 16
32 Sat Jan 10 2015 06:28:41 GMT+0000 (UTC) 6968 16
33 Sat Jan 10 2015 06:44:53 GMT+0000 (UTC) 7691 16
34 Sat Jan 10 2015 07:00:59 GMT+0000 (UTC) 7691 16
35 Sat Jan 10 2015 07:17:06 GMT+0000 (UTC) 7691 16
36 Sat Jan 10 2015 07:33:07 GMT+0000 (UTC) 5121 16
37 Sat Jan 10 2015 07:48:59 GMT+0000 (UTC) 5121 16
38 Sat Jan 10 2015 08:04:57 GMT+0000 (UTC) 5121 16
39 Sat Jan 10 2015 08:21:10 GMT+0000 (UTC) 5121 16
40 Sat Jan 10 2015 08:37:13 GMT+0000 (UTC) 5684 16
41 Sat Jan 10 2015 08:53:20 GMT+0000 (UTC) 5684 16
42 Sat Jan 10 2015 09:09:26 GMT+0000 (UTC) 5684 16
43 Sat Jan 10 2015 09:25:22 GMT+0000 (UTC) 5684 16
44 Sat Jan 10 2015 09:41:33 GMT+0000 (UTC) 6362 16
45 Sat Jan 10 2015 09:57:37 GMT+0000 (UTC) 6362 16
46 Sat Jan 10 2015 10:13:41 GMT+0000 (UTC) 6362 16
47 Sat Jan 10 2015 10:29:38 GMT+0000 (UTC) 7055 16
48 Sat Jan 10 2015 10:45:41 GMT+0000 (UTC) 7055 16
49 Sat Jan 10 2015 11:01:49 GMT+0000 (UTC) 7055 16
50 Sat Jan 10 2015 11:17:40 GMT+0000 (UTC) 7055 16
51 Sat Jan 10 2015 11:35:49 GMT+0000 (UTC) 7708 16
52 Sat Jan 10 2015 11:52:01 GMT+0000 (UTC) 7708 16
53 Sat Jan 10 2015 12:08:08 GMT+0000 (UTC) 7708 16
54 Sat Jan 10 2015 12:24:04 GMT+0000 (UTC) 8361 16
55 Sat Jan 10 2015 12:39:56 GMT+0000 (UTC) 8361 16
56 Sat Jan 10 2015 12:56:05 GMT+0000 (UTC) 8361 16
57 Sat Jan 10 2015 13:12:12 GMT+0000 (UTC) 8361 18 2
58 Sat Jan 10 2015 13:28:49 GMT+0000 (UTC) 8361 18
59 Sat Jan 10 2015 13:44:49 GMT+0000 (UTC) 9160 18
60 Sat Jan 10 2015 14:00:52 GMT+0000 (UTC) 9160 18
61 Sat Jan 10 2015 14:16:54 GMT+0000 (UTC) 9160 18
62 Sat Jan 10 2015 14:33:25 GMT+0000 (UTC) 10228 17 -1
63 Sat Jan 10 2015 14:49:24 GMT+0000 (UTC) 10228 17
64 Sat Jan 10 2015 15:05:42 GMT+0000 (UTC) 10228 17
65 Sat Jan 10 2015 15:21:31 GMT+0000 (UTC) 10228 15 -2
66 Sat Jan 10 2015 15:37:26 GMT+0000 (UTC) 11318 14 -1
67 Sat Jan 10 2015 15:53:18 GMT+0000 (UTC) 11318 14
68 Sat Jan 10 2015 16:09:18 GMT+0000 (UTC) 11318 15 1
69 Sat Jan 10 2015 16:25:08 GMT+0000 (UTC) 7420 15
70 Sat Jan 10 2015 16:43:41 GMT+0000 (UTC) 7420 15
71 Sat Jan 10 2015 16:59:34 GMT+0000 (UTC) 7420 15
72 Sat Jan 10 2015 17:15:48 GMT+0000 (UTC) 7420 15
73 Sat Jan 10 2015 17:31:51 GMT+0000 (UTC) 5328 15
74 Sat Jan 10 2015 17:47:53 GMT+0000 (UTC) 5328 15
75 Sat Jan 10 2015 18:03:56 GMT+0000 (UTC) 5328 15
76 Sat Jan 10 2015 18:19:23 GMT+0000 (UTC) 5328 15
77 Sat Jan 10 2015 18:35:25 GMT+0000 (UTC) 5678 15
78 Sat Jan 10 2015 18:51:21 GMT+0000 (UTC) 5678 16 1
79 Sat Jan 10 2015 19:07:34 GMT+0000 (UTC) 5678 16
80 Sat Jan 10 2015 19:23:38 GMT+0000 (UTC) 5884 16
81 Sat Jan 10 2015 19:39:28 GMT+0000 (UTC) 5884 16
82 Sat Jan 10 2015 19:55:36 GMT+0000 (UTC) 5884 16
83 Sat Jan 10 2015 20:12:03 GMT+0000 (UTC) 5884 16
84 Sat Jan 10 2015 20:28:12 GMT+0000 (UTC) 5994 16
85 Sat Jan 10 2015 20:44:04 GMT+0000 (UTC) 5994 16
86 Sat Jan 10 2015 21:00:15 GMT+0000 (UTC) 5994 16
87 Sat Jan 10 2015 21:16:22 GMT+0000 (UTC) 5994 16
88 Sat Jan 10 2015 21:32:57 GMT+0000 (UTC) 6086 16
89 Sat Jan 10 2015 21:49:44 GMT+0000 (UTC) 6086 16
90 Sat Jan 10 2015 22:06:21 GMT+0000 (UTC) 6086 16
91 Sat Jan 10 2015 22:22:34 GMT+0000 (UTC) 6086 16
92 Sat Jan 10 2015 22:38:34 GMT+0000 (UTC) 6192 16
93 Sat Jan 10 2015 22:54:31 GMT+0000 (UTC) 6192 17 1
94 Sat Jan 10 2015 23:10:38 GMT+0000 (UTC) 6192 17
95 Sat Jan 10 2015 23:26:41 GMT+0000 (UTC) 6322 17
96 Sat Jan 10 2015 23:42:44 GMT+0000 (UTC) 6322 17
97 Sat Jan 10 2015 23:58:42 GMT+0000 (UTC) 6322 17
98 Sun Jan 11 2015 00:14:45 GMT+0000 (UTC) 6322 17
99 Sun Jan 11 2015 00:31:06 GMT+0000 (UTC) 6562 17
100 Sun Jan 11 2015 00:47:02 GMT+0000 (UTC) 6562 17
101 Sun Jan 11 2015 01:03:29 GMT+0000 (UTC) 6562 17
102 Sun Jan 11 2015 01:19:27 GMT+0000 (UTC) 6562 17
103 Sun Jan 11 2015 01:35:26 GMT+0000 (UTC) 6977 17
104 Sun Jan 11 2015 01:51:29 GMT+0000 (UTC) 6977 17
105 Sun Jan 11 2015 02:07:36 GMT+0000 (UTC) 6977 17
106 Sun Jan 11 2015 02:23:48 GMT+0000 (UTC) 6977 17
107 Sun Jan 11 2015 02:39:44 GMT+0000 (UTC) 7632 17
108 Sun Jan 11 2015 02:55:41 GMT+0000 (UTC) 7632 17
109 Sun Jan 11 2015 03:11:57 GMT+0000 (UTC) 7632 17
110 Sun Jan 11 2015 03:28:05 GMT+0000 (UTC) 8493 16 -1
111 Sun Jan 11 2015 03:44:10 GMT+0000 (UTC) 8493 16
112 Sun Jan 11 2015 04:00:06 GMT+0000 (UTC) 8493 16
113 Sun Jan 11 2015 04:16:15 GMT+0000 (UTC) 8493 16
114 Sun Jan 11 2015 04:32:10 GMT+0000 (UTC) 9467 16
115 Sun Jan 11 2015 04:48:08 GMT+0000 (UTC) 9467 16
116 Sun Jan 11 2015 05:04:08 GMT+0000 (UTC) 9467 16
117 Sun Jan 11 2015 05:20:37 GMT+0000 (UTC) 9467 16
118 Sun Jan 11 2015 05:36:32 GMT+0000 (UTC) 6006 16
119 Sun Jan 11 2015 05:52:28 GMT+0000 (UTC) 6006 16
120 Sun Jan 11 2015 06:08:36 GMT+0000 (UTC) 6006 16
121 Sun Jan 11 2015 06:24:48 GMT+0000 (UTC) 6006 16
122 Sun Jan 11 2015 06:40:52 GMT+0000 (UTC) 6697 16
123 Sun Jan 11 2015 06:56:40 GMT+0000 (UTC) 6697 16
124 Sun Jan 11 2015 07:12:39 GMT+0000 (UTC) 6697 16
125 Sun Jan 11 2015 07:28:39 GMT+0000 (UTC) 6697 16
126 Sun Jan 11 2015 07:44:41 GMT+0000 (UTC) 7468 16
127 Sun Jan 11 2015 08:00:46 GMT+0000 (UTC) 7468 16
128 Sun Jan 11 2015 08:16:51 GMT+0000 (UTC) 7468 16
129 Sun Jan 11 2015 08:32:50 GMT+0000 (UTC) 8278 16
130 Sun Jan 11 2015 08:48:58 GMT+0000 (UTC) 8278 16
131 Sun Jan 11 2015 09:05:01 GMT+0000 (UTC) 8278 15 -1
132 Sun Jan 11 2015 09:21:21 GMT+0000 (UTC) 8278 15
133 Sun Jan 11 2015 09:37:41 GMT+0000 (UTC) 9218 15
134 Sun Jan 11 2015 09:53:58 GMT+0000 (UTC) 9218 15
135 Sun Jan 11 2015 10:10:25 GMT+0000 (UTC) 9218 15
136 Sun Jan 11 2015 10:26:20 GMT+0000 (UTC) 9218 15
137 Sun Jan 11 2015 10:42:27 GMT+0000 (UTC) 5988 15
138 Sun Jan 11 2015 10:59:05 GMT+0000 (UTC) 5988 15
139 Sun Jan 11 2015 11:15:12 GMT+0000 (UTC) 5988 15
140 Sun Jan 11 2015 11:31:20 GMT+0000 (UTC) 6705 15
141 Sun Jan 11 2015 11:47:14 GMT+0000 (UTC) 6705 15
142 Sun Jan 11 2015 12:03:20 GMT+0000 (UTC) 6705 15
143 Sun Jan 11 2015 12:19:20 GMT+0000 (UTC) 6705 15
144 Sun Jan 11 2015 12:35:30 GMT+0000 (UTC) 7456 15
145 Sun Jan 11 2015 12:51:37 GMT+0000 (UTC) 7456 16 1
146 Sun Jan 11 2015 13:07:34 GMT+0000 (UTC) 7456 16
147 Sun Jan 11 2015 13:23:33 GMT+0000 (UTC) 7456 16
148 Sun Jan 11 2015 13:39:53 GMT+0000 (UTC) 8291 16
149 Sun Jan 11 2015 13:55:52 GMT+0000 (UTC) 8291 16
150 Sun Jan 11 2015 14:12:09 GMT+0000 (UTC) 8291 15 -1
151 Sun Jan 11 2015 14:28:38 GMT+0000 (UTC) 9329 15
152 Sun Jan 11 2015 14:44:25 GMT+0000 (UTC) 9329 15
153 Sun Jan 11 2015 15:00:26 GMT+0000 (UTC) 9329 15
154 Sun Jan 11 2015 15:16:51 GMT+0000 (UTC) 9329 14 -1
155 Sun Jan 11 2015 15:33:02 GMT+0000 (UTC) 10570 14
156 Sun Jan 11 2015 15:49:02 GMT+0000 (UTC) 10570 14
157 Sun Jan 11 2015 16:05:13 GMT+0000 (UTC) 10570 14
158 Sun Jan 11 2015 16:21:24 GMT+0000 (UTC) 10570 14
159 Sun Jan 11 2015 16:37:27 GMT+0000 (UTC) 7222 14
160 Sun Jan 11 2015 16:53:43 GMT+0000 (UTC) 7222 14
161 Sun Jan 11 2015 17:09:52 GMT+0000 (UTC) 7222 14
162 Sun Jan 11 2015 17:25:57 GMT+0000 (UTC) 7222 14
163 Sun Jan 11 2015 17:42:17 GMT+0000 (UTC) 7853 14
164 Sun Jan 11 2015 17:58:23 GMT+0000 (UTC) 7853 14
165 Sun Jan 11 2015 18:14:25 GMT+0000 (UTC) 7853 14
166 Sun Jan 11 2015 18:30:42 GMT+0000 (UTC) 8284 15 1
167 Sun Jan 11 2015 18:46:49 GMT+0000 (UTC) 8284 15
168 Sun Jan 11 2015 19:02:59 GMT+0000 (UTC) 8284 15
169 Sun Jan 11 2015 19:18:59 GMT+0000 (UTC) 8284 15
170 Sun Jan 11 2015 19:35:11 GMT+0000 (UTC) 8521 15
171 Sun Jan 11 2015 19:51:16 GMT+0000 (UTC) 8521 15
172 Sun Jan 11 2015 20:07:31 GMT+0000 (UTC) 8521 15
173 Sun Jan 11 2015 20:23:40 GMT+0000 (UTC) 8521 15
174 Sun Jan 11 2015 20:39:44 GMT+0000 (UTC) 8633 15
175 Sun Jan 11 2015 20:55:43 GMT+0000 (UTC) 8633 15
176 Sun Jan 11 2015 21:11:51 GMT+0000 (UTC) 8633 15
177 Sun Jan 11 2015 21:28:43 GMT+0000 (UTC) 8639 15
178 Sun Jan 11 2015 21:45:39 GMT+0000 (UTC) 8639 15
179 Sun Jan 11 2015 22:01:47 GMT+0000 (UTC) 8639 15
180 Sun Jan 11 2015 22:19:06 GMT+0000 (UTC) 8639 15
181 Sun Jan 11 2015 22:36:19 GMT+0000 (UTC) 8695 15
182 Sun Jan 11 2015 22:52:26 GMT+0000 (UTC) 8695 15
183 Sun Jan 11 2015 23:08:39 GMT+0000 (UTC) 8695 15
184 Sun Jan 11 2015 23:24:53 GMT+0000 (UTC) 8695 15
185 Sun Jan 11 2015 23:40:51 GMT+0000 (UTC) 8735 15
186 Sun Jan 11 2015 23:56:57 GMT+0000 (UTC) 8735 15
187 Mon Jan 12 2015 00:13:08 GMT+0000 (UTC) 8735 15
188 Mon Jan 12 2015 00:29:17 GMT+0000 (UTC) 8735 15
189 Mon Jan 12 2015 00:45:16 GMT+0000 (UTC) 8931 15
190 Mon Jan 12 2015 01:01:36 GMT+0000 (UTC) 8931 15
191 Mon Jan 12 2015 01:17:50 GMT+0000 (UTC) 8931 14 -1
192 Mon Jan 12 2015 01:33:52 GMT+0000 (UTC) 9403 14
193 Mon Jan 12 2015 01:49:55 GMT+0000 (UTC) 9403 14
194 Mon Jan 12 2015 02:06:07 GMT+0000 (UTC) 9403 14
195 Mon Jan 12 2015 02:22:23 GMT+0000 (UTC) 9403 14
196 Mon Jan 12 2015 02:38:30 GMT+0000 (UTC) 10241 14
197 Mon Jan 12 2015 02:54:33 GMT+0000 (UTC) 10241 14
198 Mon Jan 12 2015 03:10:31 GMT+0000 (UTC) 10241 14
199 Mon Jan 12 2015 03:26:29 GMT+0000 (UTC) 10241 14
200 Mon Jan 12 2015 03:42:41 GMT+0000 (UTC) 6380 14
201 Mon Jan 12 2015 03:59:01 GMT+0000 (UTC) 6380 14
202 Mon Jan 12 2015 04:15:11 GMT+0000 (UTC) 6380 14
203 Mon Jan 12 2015 04:31:12 GMT+0000 (UTC) 7348 14
204 Mon Jan 12 2015 04:47:29 GMT+0000 (UTC) 7348 14
205 Mon Jan 12 2015 05:03:18 GMT+0000 (UTC) 7348 14
206 Mon Jan 12 2015 05:19:10 GMT+0000 (UTC) 7348 14
207 Mon Jan 12 2015 05:35:07 GMT+0000 (UTC) 8244 14
208 Mon Jan 12 2015 05:51:10 GMT+0000 (UTC) 8244 14
209 Mon Jan 12 2015 06:07:10 GMT+0000 (UTC) 8244 14
210 Mon Jan 12 2015 06:23:14 GMT+0000 (UTC) 8244 14
211 Mon Jan 12 2015 06:39:29 GMT+0000 (UTC) 9200 14
212 Mon Jan 12 2015 06:55:36 GMT+0000 (UTC) 9200 14
213 Mon Jan 12 2015 07:11:31 GMT+0000 (UTC) 9200 14
214 Mon Jan 12 2015 07:27:44 GMT+0000 (UTC) 9200 14
215 Mon Jan 12 2015 07:43:44 GMT+0000 (UTC) 10237 14
216 Mon Jan 12 2015 07:59:51 GMT+0000 (UTC) 10237 14
217 Mon Jan 12 2015 08:15:55 GMT+0000 (UTC) 10237 14
218 Mon Jan 12 2015 08:31:53 GMT+0000 (UTC) 11335 14
219 Mon Jan 12 2015 08:48:00 GMT+0000 (UTC) 11335 14
220 Mon Jan 12 2015 09:03:54 GMT+0000 (UTC) 11335 14
221 Mon Jan 12 2015 09:19:49 GMT+0000 (UTC) 11335 14
222 Mon Jan 12 2015 09:36:02 GMT+0000 (UTC) 12556 14
223 Mon Jan 12 2015 09:52:33 GMT+0000 (UTC) 12556 14
224 Mon Jan 12 2015 10:08:25 GMT+0000 (UTC) 12556 14
225 Mon Jan 12 2015 10:24:45 GMT+0000 (UTC) 12556 14
226 Mon Jan 12 2015 10:41:12 GMT+0000 (UTC) 13886 14
227 Mon Jan 12 2015 10:57:18 GMT+0000 (UTC) 13886 14
228 Mon Jan 12 2015 11:13:44 GMT+0000 (UTC) 13886 14
229 Mon Jan 12 2015 11:30:01 GMT+0000 (UTC) 15020 14
230 Mon Jan 12 2015 11:45:58 GMT+0000 (UTC) 15020 14
231 Mon Jan 12 2015 12:01:47 GMT+0000 (UTC) 15020 14
232 Mon Jan 12 2015 12:18:07 GMT+0000 (UTC) 15020 14
233 Mon Jan 12 2015 12:34:18 GMT+0000 (UTC) 16087 14
234 Mon Jan 12 2015 12:50:17 GMT+0000 (UTC) 16087 14
235 Mon Jan 12 2015 13:06:19 GMT+0000 (UTC) 16087 14
236 Mon Jan 12 2015 13:22:19 GMT+0000 (UTC) 16087 14
237 Mon Jan 12 2015 13:38:41 GMT+0000 (UTC) 17478 14
238 Mon Jan 12 2015 13:54:45 GMT+0000 (UTC) 17478 14
239 Mon Jan 12 2015 14:11:04 GMT+0000 (UTC) 17478 14
240 Mon Jan 12 2015 14:26:58 GMT+0000 (UTC) 17478 14
241 Mon Jan 12 2015 14:43:16 GMT+0000 (UTC) 19333 14
242 Mon Jan 12 2015 14:59:24 GMT+0000 (UTC) 19333 14
243 Mon Jan 12 2015 15:15:30 GMT+0000 (UTC) 19333 14
244 Mon Jan 12 2015 15:31:38 GMT+0000 (UTC) 21418 13 -1
245 Mon Jan 12 2015 15:47:48 GMT+0000 (UTC) 21418 13
246 Mon Jan 12 2015 16:03:47 GMT+0000 (UTC) 21418 13
247 Mon Jan 12 2015 16:19:55 GMT+0000 (UTC) 21418 13
248 Mon Jan 12 2015 16:35:50 GMT+0000 (UTC) 23082 13
249 Mon Jan 12 2015 16:52:10 GMT+0000 (UTC) 23082 13
250 Mon Jan 12 2015 17:08:32 GMT+0000 (UTC) 23082 13
251 Mon Jan 12 2015 17:24:25 GMT+0000 (UTC) 23082 13
252 Mon Jan 12 2015 17:40:27 GMT+0000 (UTC) 23988 13
253 Mon Jan 12 2015 17:56:32 GMT+0000 (UTC) 23988 13
254 Mon Jan 12 2015 18:12:32 GMT+0000 (UTC) 23988 13
255 Mon Jan 12 2015 18:28:53 GMT+0000 (UTC) 24181 13
256 Mon Jan 12 2015 18:45:05 GMT+0000 (UTC) 24181 13
257 Mon Jan 12 2015 19:01:22 GMT+0000 (UTC) 24181 13
258 Mon Jan 12 2015 19:17:10 GMT+0000 (UTC) 24181 13
259 Mon Jan 12 2015 19:33:13 GMT+0000 (UTC) 23793 13
260 Mon Jan 12 2015 19:49:16 GMT+0000 (UTC) 23793 13
261 Mon Jan 12 2015 20:07:33 GMT+0000 (UTC) 23793 13
262 Mon Jan 12 2015 20:24:01 GMT+0000 (UTC) 23793 13
263 Mon Jan 12 2015 20:40:14 GMT+0000 (UTC) 23193 13
264 Mon Jan 12 2015 20:56:15 GMT+0000 (UTC) 23193 13
265 Mon Jan 12 2015 21:12:19 GMT+0000 (UTC) 23193 13
266 Mon Jan 12 2015 21:28:33 GMT+0000 (UTC) 22496 13
267 Mon Jan 12 2015 21:46:02 GMT+0000 (UTC) 22496 13
268 Mon Jan 12 2015 22:04:38 GMT+0000 (UTC) 22496 13
269 Mon Jan 12 2015 22:20:33 GMT+0000 (UTC) 22496 12 -1
270 Mon Jan 12 2015 22:37:15 GMT+0000 (UTC) 21877 12
271 Mon Jan 12 2015 22:53:46 GMT+0000 (UTC) 21877 12
272 Mon Jan 12 2015 23:10:02 GMT+0000 (UTC) 21877 13 1
273 Mon Jan 12 2015 23:26:10 GMT+0000 (UTC) 21512 13
274 Mon Jan 12 2015 23:41:28 GMT+0000 (UTC) 21512 12 -1
275 Mon Jan 12 2015 23:56:37 GMT+0000 (UTC) 21512 12
276 Tue Jan 13 2015 00:11:58 GMT+0000 (UTC) 21512 12
277 Tue Jan 13 2015 00:27:06 GMT+0000 (UTC) 21512 12
278 Tue Jan 13 2015 00:43:27 GMT+0000 (UTC) 9852 12
279 Tue Jan 13 2015 00:59:29 GMT+0000 (UTC) 9852 12
280 Tue Jan 13 2015 01:14:52 GMT+0000 (UTC) 9852 12
281 Tue Jan 13 2015 01:30:16 GMT+0000 (UTC) 5918 12
282 Tue Jan 13 2015 01:45:50 GMT+0000 (UTC) 5918 12
283 Tue Jan 13 2015 02:01:19 GMT+0000 (UTC) 5918 12
284 Tue Jan 13 2015 02:17:30 GMT+0000 (UTC) 5918 12
285 Tue Jan 13 2015 02:33:41 GMT+0000 (UTC) 6536 12
286 Tue Jan 13 2015 02:49:50 GMT+0000 (UTC) 6536 12
287 Tue Jan 13 2015 03:05:55 GMT+0000 (UTC) 6536 12
288 Tue Jan 13 2015 03:21:51 GMT+0000 (UTC) 6536 12
289 Tue Jan 13 2015 03:38:03 GMT+0000 (UTC) 7348 12
290 Tue Jan 13 2015 03:54:04 GMT+0000 (UTC) 7348 12
291 Tue Jan 13 2015 04:10:09 GMT+0000 (UTC) 7348 12
292 Tue Jan 13 2015 04:26:16 GMT+0000 (UTC) 7348 12
293 Tue Jan 13 2015 04:42:13 GMT+0000 (UTC) 8247 12
294 Tue Jan 13 2015 04:58:13 GMT+0000 (UTC) 8247 12
295 Tue Jan 13 2015 05:14:17 GMT+0000 (UTC) 8247 12
296 Tue Jan 13 2015 05:30:12 GMT+0000 (UTC) 9214 12
297 Tue Jan 13 2015 05:46:06 GMT+0000 (UTC) 9214 12
298 Tue Jan 13 2015 06:02:17 GMT+0000 (UTC) 9214 12
299 Tue Jan 13 2015 06:18:25 GMT+0000 (UTC) 9214 12
300 Tue Jan 13 2015 06:34:27 GMT+0000 (UTC) 10271 12
301 Tue Jan 13 2015 06:50:23 GMT+0000 (UTC) 10271 11 -1
302 Tue Jan 13 2015 07:06:24 GMT+0000 (UTC) 10271 11
303 Tue Jan 13 2015 07:22:33 GMT+0000 (UTC) 10271 11
304 Tue Jan 13 2015 07:38:28 GMT+0000 (UTC) 11385 11
305 Tue Jan 13 2015 07:54:37 GMT+0000 (UTC) 11385 11
306 Tue Jan 13 2015 08:10:48 GMT+0000 (UTC) 11385 11
307 Tue Jan 13 2015 08:27:43 GMT+0000 (UTC) 11385 11
308 Tue Jan 13 2015 08:43:38 GMT+0000 (UTC) 6939 11
309 Tue Jan 13 2015 08:59:37 GMT+0000 (UTC) 6939 11
310 Tue Jan 13 2015 09:15:47 GMT+0000 (UTC) 6939 11
311 Tue Jan 13 2015 09:31:39 GMT+0000 (UTC) 7724 11
312 Tue Jan 13 2015 09:47:41 GMT+0000 (UTC) 7724 11
313 Tue Jan 13 2015 10:03:33 GMT+0000 (UTC) 7724 11
314 Tue Jan 13 2015 10:19:35 GMT+0000 (UTC) 7724 11
315 Tue Jan 13 2015 10:35:53 GMT+0000 (UTC) 8539 11
316 Tue Jan 13 2015 10:52:07 GMT+0000 (UTC) 8539 11
317 Tue Jan 13 2015 11:08:03 GMT+0000 (UTC) 8539 11
318 Tue Jan 13 2015 11:24:13 GMT+0000 (UTC) 8539 11
319 Tue Jan 13 2015 11:40:18 GMT+0000 (UTC) 9390 11
320 Tue Jan 13 2015 11:56:28 GMT+0000 (UTC) 9390 11
321 Tue Jan 13 2015 12:12:26 GMT+0000 (UTC) 9390 11
322 Tue Jan 13 2015 12:28:09 GMT+0000 (UTC) 10353 11
323 Tue Jan 13 2015 12:44:30 GMT+0000 (UTC) 10353 11
324 Tue Jan 13 2015 13:00:30 GMT+0000 (UTC) 10353 11
325 Tue Jan 13 2015 13:16:22 GMT+0000 (UTC) 10353 11
326 Tue Jan 13 2015 13:32:49 GMT+0000 (UTC) 11539 11
327 Tue Jan 13 2015 13:48:56 GMT+0000 (UTC) 11539 11
328 Tue Jan 13 2015 14:04:52 GMT+0000 (UTC) 11539 11
329 Tue Jan 13 2015 14:20:47 GMT+0000 (UTC) 11539 11
330 Tue Jan 13 2015 14:37:06 GMT+0000 (UTC) 13108 11
331 Tue Jan 13 2015 14:52:47 GMT+0000 (UTC) 13108 11
332 Tue Jan 13 2015 15:08:54 GMT+0000 (UTC) 13108 11
333 Tue Jan 13 2015 15:24:53 GMT+0000 (UTC) 13108 11
334 Tue Jan 13 2015 15:40:49 GMT+0000 (UTC) 14851 11
335 Tue Jan 13 2015 15:59:02 GMT+0000 (UTC) 14851 11
336 Tue Jan 13 2015 16:15:00 GMT+0000 (UTC) 14851 11
337 Tue Jan 13 2015 16:31:00 GMT+0000 (UTC) 16445 11
338 Tue Jan 13 2015 16:47:19 GMT+0000 (UTC) 16445 12 1
339 Tue Jan 13 2015 17:03:16 GMT+0000 (UTC) 16445 12
340 Tue Jan 13 2015 17:19:13 GMT+0000 (UTC) 16445 12
341 Tue Jan 13 2015 17:35:33 GMT+0000 (UTC) 17500 12
342 Tue Jan 13 2015 17:51:37 GMT+0000 (UTC) 17500 12
343 Tue Jan 13 2015 18:07:52 GMT+0000 (UTC) 17500 12
344 Tue Jan 13 2015 18:23:43 GMT+0000 (UTC) 17500 12
345 Tue Jan 13 2015 18:40:09 GMT+0000 (UTC) 17895 12
346 Tue Jan 13 2015 18:56:07 GMT+0000 (UTC) 17895 12
347 Tue Jan 13 2015 19:12:24 GMT+0000 (UTC) 17895 12
348 Tue Jan 13 2015 19:28:10 GMT+0000 (UTC) 17911 12
349 Tue Jan 13 2015 19:44:35 GMT+0000 (UTC) 17911 12
350 Tue Jan 13 2015 20:00:52 GMT+0000 (UTC) 17911 12
351 Tue Jan 13 2015 20:17:11 GMT+0000 (UTC) 17911 12
352 Tue Jan 13 2015 20:33:18 GMT+0000 (UTC) 17748 12
353 Tue Jan 13 2015 20:49:19 GMT+0000 (UTC) 17748 12
354 Tue Jan 13 2015 21:05:36 GMT+0000 (UTC) 17748 12
355 Tue Jan 13 2015 21:22:11 GMT+0000 (UTC) 17748 12
356 Tue Jan 13 2015 21:38:45 GMT+0000 (UTC) 17477 12
357 Tue Jan 13 2015 21:55:01 GMT+0000 (UTC) 17477 11 -1
358 Tue Jan 13 2015 22:11:14 GMT+0000 (UTC) 17477 11
359 Tue Jan 13 2015 22:27:47 GMT+0000 (UTC) 17276 11
360 Tue Jan 13 2015 22:43:59 GMT+0000 (UTC) 17276 11
361 Tue Jan 13 2015 23:00:04 GMT+0000 (UTC) 17276 11
362 Tue Jan 13 2015 23:16:06 GMT+0000 (UTC) 17276 11
363 Tue Jan 13 2015 23:32:15 GMT+0000 (UTC) 8058 11
364 Tue Jan 13 2015 23:48:00 GMT+0000 (UTC) 8058 11
365 Wed Jan 14 2015 00:04:06 GMT+0000 (UTC) 8058 11
366 Wed Jan 14 2015 00:20:08 GMT+0000 (UTC) 8058 11
367 Wed Jan 14 2015 00:36:24 GMT+0000 (UTC) 8525 11
368 Wed Jan 14 2015 00:52:32 GMT+0000 (UTC) 8525 11
369 Wed Jan 14 2015 01:09:16 GMT+0000 (UTC) 8525 11
370 Wed Jan 14 2015 01:25:46 GMT+0000 (UTC) 8525 11
371 Wed Jan 14 2015 01:41:39 GMT+0000 (UTC) 9207 11
372 Wed Jan 14 2015 01:57:26 GMT+0000 (UTC) 9207 11
373 Wed Jan 14 2015 02:13:40 GMT+0000 (UTC) 9207 11
374 Wed Jan 14 2015 02:29:51 GMT+0000 (UTC) 10123 11
375 Wed Jan 14 2015 02:45:48 GMT+0000 (UTC) 10123 11
376 Wed Jan 14 2015 03:19:15 GMT+0000 (UTC) 10123 11
377 Wed Jan 14 2015 03:35:18 GMT+0000 (UTC) 11319 11
378 Wed Jan 14 2015 03:51:06 GMT+0000 (UTC) 11319 11
379 Wed Jan 14 2015 04:07:24 GMT+0000 (UTC) 11319 11
380 Wed Jan 14 2015 04:23:17 GMT+0000 (UTC) 11319 11
381 Wed Jan 14 2015 04:39:23 GMT+0000 (UTC) 12585 11
382 Wed Jan 14 2015 04:55:48 GMT+0000 (UTC) 12585 11
383 Wed Jan 14 2015 05:12:22 GMT+0000 (UTC) 12585 11
384 Wed Jan 14 2015 05:28:27 GMT+0000 (UTC) 13925 11
385 Wed Jan 14 2015 05:44:25 GMT+0000 (UTC) 13925 11
386 Wed Jan 14 2015 06:00:25 GMT+0000 (UTC) 13925 11
387 Wed Jan 14 2015 06:16:45 GMT+0000 (UTC) 13925 11
388 Wed Jan 14 2015 06:32:33 GMT+0000 (UTC) 15208 11
389 Wed Jan 14 2015 06:48:27 GMT+0000 (UTC) 15208 10 -1
390 Wed Jan 14 2015 07:04:35 GMT+0000 (UTC) 15208 10
391 Wed Jan 14 2015 07:20:30 GMT+0000 (UTC) 15208 10
392 Wed Jan 14 2015 07:36:19 GMT+0000 (UTC) 16501 10
393 Wed Jan 14 2015 07:52:21 GMT+0000 (UTC) 16501 10
394 Wed Jan 14 2015 08:08:18 GMT+0000 (UTC) 16501 10
395 Wed Jan 14 2015 08:24:18 GMT+0000 (UTC) 16501 10
396 Wed Jan 14 2015 08:40:10 GMT+0000 (UTC) 8673 10
397 Wed Jan 14 2015 08:56:41 GMT+0000 (UTC) 8673 10
398 Wed Jan 14 2015 09:12:28 GMT+0000 (UTC) 8673 9 -1
399 Wed Jan 14 2015 09:28:31 GMT+0000 (UTC) 8673 9
400 Wed Jan 14 2015 09:44:42 GMT+0000 (UTC) 9655 9
401 Wed Jan 14 2015 10:00:27 GMT+0000 (UTC) 9655 9
402 Wed Jan 14 2015 10:16:26 GMT+0000 (UTC) 9655 9
403 Wed Jan 14 2015 10:32:08 GMT+0000 (UTC) 10706 9
404 Wed Jan 14 2015 10:48:08 GMT+0000 (UTC) 10706 9
405 Wed Jan 14 2015 11:04:15 GMT+0000 (UTC) 10706 9
406 Wed Jan 14 2015 11:20:13 GMT+0000 (UTC) 10706 9
407 Wed Jan 14 2015 11:36:25 GMT+0000 (UTC) 6790 9
408 Wed Jan 14 2015 11:52:17 GMT+0000 (UTC) 6790 9
409 Wed Jan 14 2015 12:25:00 GMT+0000 (UTC) 6790 9
410 Wed Jan 14 2015 12:41:19 GMT+0000 (UTC) 7548 9
411 Wed Jan 14 2015 12:57:17 GMT+0000 (UTC) 7548 9
412 Wed Jan 14 2015 13:13:01 GMT+0000 (UTC) 7548 9
413 Wed Jan 14 2015 13:29:13 GMT+0000 (UTC) 8557 9
414 Wed Jan 14 2015 13:45:02 GMT+0000 (UTC) 8557 9
415 Wed Jan 14 2015 14:01:08 GMT+0000 (UTC) 8557 9
416 Wed Jan 14 2015 14:17:16 GMT+0000 (UTC) 8557 9
417 Wed Jan 14 2015 14:33:31 GMT+0000 (UTC) 9816 9
418 Wed Jan 14 2015 14:49:32 GMT+0000 (UTC) 9816 9
419 Wed Jan 14 2015 15:05:36 GMT+0000 (UTC) 9816 9
420 Wed Jan 14 2015 15:21:32 GMT+0000 (UTC) 9816 9
421 Wed Jan 14 2015 15:37:45 GMT+0000 (UTC) 11332 9
422 Wed Jan 14 2015 15:53:45 GMT+0000 (UTC) 11332 9
423 Wed Jan 14 2015 16:09:52 GMT+0000 (UTC) 11332 9
424 Wed Jan 14 2015 16:25:39 GMT+0000 (UTC) 11332 9
425 Wed Jan 14 2015 16:41:54 GMT+0000 (UTC) 12733 9
426 Wed Jan 14 2015 16:58:01 GMT+0000 (UTC) 12733 9
427 Wed Jan 14 2015 17:13:51 GMT+0000 (UTC) 12733 9
428 Wed Jan 14 2015 17:29:55 GMT+0000 (UTC) 13714 9
429 Wed Jan 14 2015 17:45:41 GMT+0000 (UTC) 13714 9
430 Wed Jan 14 2015 18:01:31 GMT+0000 (UTC) 13714 9
431 Wed Jan 14 2015 18:17:30 GMT+0000 (UTC) 13714 9
432 Wed Jan 14 2015 18:33:54 GMT+0000 (UTC) 14293 9
433 Wed Jan 14 2015 18:49:54 GMT+0000 (UTC) 14293 9
434 Wed Jan 14 2015 19:07:22 GMT+0000 (UTC) 14293 9
435 Wed Jan 14 2015 19:23:17 GMT+0000 (UTC) 14293 9
436 Wed Jan 14 2015 19:39:13 GMT+0000 (UTC) 14293 9
437 Wed Jan 14 2015 19:55:07 GMT+0000 (UTC) 14293 9
438 Wed Jan 14 2015 20:11:38 GMT+0000 (UTC) 14293 9
439 Wed Jan 14 2015 20:27:50 GMT+0000 (UTC) 14587 9
440 Wed Jan 14 2015 20:43:55 GMT+0000 (UTC) 14587 9
441 Wed Jan 14 2015 21:00:01 GMT+0000 (UTC) 14587 9
442 Wed Jan 14 2015 21:15:53 GMT+0000 (UTC) 14587 9
443 Wed Jan 14 2015 21:32:27 GMT+0000 (UTC) 14518 9
444 Wed Jan 14 2015 21:50:25 GMT+0000 (UTC) 14518 9
445 Wed Jan 14 2015 22:06:19 GMT+0000 (UTC) 14518 9
446 Wed Jan 14 2015 22:22:18 GMT+0000 (UTC) 14518 9
447 Wed Jan 14 2015 22:39:35 GMT+0000 (UTC) 14491 9
448 Wed Jan 14 2015 22:55:37 GMT+0000 (UTC) 14491 9
449 Wed Jan 14 2015 23:11:33 GMT+0000 (UTC) 14491 9
450 Wed Jan 14 2015 23:27:27 GMT+0000 (UTC) 14491 9
451 Wed Jan 14 2015 23:43:33 GMT+0000 (UTC) 14662 9
452 Wed Jan 14 2015 23:59:36 GMT+0000 (UTC) 14662 9
453 Thu Jan 15 2015 00:15:49 GMT+0000 (UTC) 14662 9
454 Thu Jan 15 2015 00:31:50 GMT+0000 (UTC) 15165 9
455 Thu Jan 15 2015 00:48:01 GMT+0000 (UTC) 15165 9
456 Thu Jan 15 2015 01:03:55 GMT+0000 (UTC) 15165 9
457 Thu Jan 15 2015 01:19:42 GMT+0000 (UTC) 15165 9
458 Thu Jan 15 2015 01:35:50 GMT+0000 (UTC) 15921 9
459 Thu Jan 15 2015 01:51:49 GMT+0000 (UTC) 15921 9
460 Thu Jan 15 2015 02:08:00 GMT+0000 (UTC) 15921 9
461 Thu Jan 15 2015 02:23:49 GMT+0000 (UTC) 15921 9
462 Thu Jan 15 2015 02:39:48 GMT+0000 (UTC) 17038 9
463 Thu Jan 15 2015 02:55:56 GMT+0000 (UTC) 17038 9
464 Thu Jan 15 2015 03:12:06 GMT+0000 (UTC) 17038 9
465 Thu Jan 15 2015 03:27:51 GMT+0000 (UTC) 18520 8 -1
466 Thu Jan 15 2015 03:43:48 GMT+0000 (UTC) 18520 8
467 Thu Jan 15 2015 03:59:52 GMT+0000 (UTC) 18520 8
468 Thu Jan 15 2015 04:15:59 GMT+0000 (UTC) 18520 8
469 Thu Jan 15 2015 04:32:03 GMT+0000 (UTC) 18520 8
470 Thu Jan 15 2015 04:48:01 GMT+0000 (UTC) 20107 8
471 Thu Jan 15 2015 05:04:15 GMT+0000 (UTC) 20107 8
472 Thu Jan 15 2015 05:20:03 GMT+0000 (UTC) 20107 7 -1
473 Thu Jan 15 2015 05:35:57 GMT+0000 (UTC) 10032 7
474 Thu Jan 15 2015 05:52:05 GMT+0000 (UTC) 10032 6 -1
475 Thu Jan 15 2015 06:08:20 GMT+0000 (UTC) 10032 6
476 Thu Jan 15 2015 06:24:21 GMT+0000 (UTC) 10032 6
477 Thu Jan 15 2015 06:40:04 GMT+0000 (UTC) 11254 6
478 Thu Jan 15 2015 06:56:25 GMT+0000 (UTC) 11254 6
479 Thu Jan 15 2015 07:12:23 GMT+0000 (UTC) 11254 6
480 Thu Jan 15 2015 07:28:21 GMT+0000 (UTC) 4304 6
481 Thu Jan 15 2015 07:44:25 GMT+0000 (UTC) 4304 6
482 Thu Jan 15 2015 08:06:30 GMT+0000 (UTC) 4304 6
483 Thu Jan 15 2015 09:03:10 GMT+0000 (UTC) 4966 6
484 Thu Jan 15 2015 09:22:45 GMT+0000 (UTC) 4966 5 -1
485 Thu Jan 15 2015 09:38:57 GMT+0000 (UTC) 5655 5
486 Thu Jan 15 2015 09:55:39 GMT+0000 (UTC) 5655 5
487 Thu Jan 15 2015 10:15:15 GMT+0000 (UTC) 5655 5
488 Thu Jan 15 2015 10:31:12 GMT+0000 (UTC) 6384 5
489 Thu Jan 15 2015 10:47:28 GMT+0000 (UTC) 6384 5
490 Thu Jan 15 2015 11:03:28 GMT+0000 (UTC) 6384 4 -1
491 Thu Jan 15 2015 11:21:10 GMT+0000 (UTC) 6384 4
492 Thu Jan 15 2015 11:37:37 GMT+0000 (UTC) 4623 4
493 Thu Jan 15 2015 11:53:55 GMT+0000 (UTC) 4623 4
494 Thu Jan 15 2015 12:10:04 GMT+0000 (UTC) 4623 4
495 Thu Jan 15 2015 12:26:17 GMT+0000 (UTC) 5225 4
496 Thu Jan 15 2015 12:41:46 GMT+0000 (UTC) 5225 4

見えてくるもの



 観察時間である、日本時間の2015年01月10日 07時25分から01月15日 21時41分までで、在庫数は22個減って、10個増えています。単純に考えると、在庫の減は売れた数で、増は入荷した数だと思います。ただ、在庫の増については、キャンセルも考えられます。そのあたりの事情は外から見えないので、検討の対象外とします。
 そしてデータを見ていると、次の傾向が解ります。

  • 在庫の更新は、リアルタイム
  • 順位の更新は、1時間ごと。また、直前の1時間前のデータではなく、2時間前のデータが反映される
  • 休日夜間等の時間帯によって、ランクの増減幅が異なる
  • 一日に1〜2冊程度の売上で、10,000〜20,000位くらい

感想



 今回は、1冊の本を対象に在庫とランキングの関係をみていました。対象を広げて、Amazonの上位10万冊くらいのデータを定期的に取得すれば、もっと見えてくるものがありそうです。ただし、15分おきに5日ほど取得したとすれば、10万×96×5と4,800万回の取得が必要です。間違いなく怒られそうなので、自重しておきます。一度解析すれば、マーケティングデータを取得する際の推定とかに使えそうな気がしますね。

See Also
Amazonのランキングの不思議
プログラミング・レスで5分でサックリWebスクレイピング「kimonolabs」
『Rubyによるクローラー開発技法』を書きました

Amazonランキングの謎を解く: 確率的な順位付けが教える売上の構造 (DOJIN選書)

Amazonランキングの謎を解く: 確率的な順位付けが教える売上の構造 (DOJIN選書)

Rubyによるクローラー開発技法 巡回・解析機能の実装と21の運用例

Rubyによるクローラー開発技法 巡回・解析機能の実装と21の運用例