google-analytics - 尽管 session 数较少，但 Google Analytics(分析)抽样

Question

我正在使用 Google Analytics Reporting API，但即使指定日期范围内的 session 远少于 500K limit，我也会得到抽样结果。 .我一个月只有约 4K 次 session 。

我还将“samplingLevel”设置为“LARGE”。

这是 Python 查询:

    response=analytics.reports().batchGet(
  body={
    "reportRequests":[
    {
      "viewId":myViewID,
      "dateRanges":[
        {
          "startDate":"2017-05-01",
          "endDate":"2017-05-30"
        }],
    "samplingLevel":"LARGE",
      "metrics":[
        {
          "expression":"ga:sessions"
        }],
      "dimensions": [
        {
          "name":"ga:browser"

        },
        {
          "name":"ga:city",
        }
        ]
      }]
  }
).execute()

正如您在下面看到的示例空间是 4365 个 session ，远小于 500K 的限制

response.get('reports', [])[0].get('data',[]).get('samplesReadCounts',[])
Out[31]: [u'2051']

response.get('reports', [])[0].get('data',[]).get('samplingSpaceSizes',[])
Out[32]: [u'4365']

将请求分解为较小的日期范围也无济于事。我使用 R 中的 GoogleAnalyticsR 库和 anti_sample=TRUE 进行了尝试。

    > web_data <- google_analytics_4(view_id, 
+                                 date_range = c("2017-05-01", "2017-05-30"),
+                                 dimensions = c("city","browser"),
+                                 metrics = c("hits"),
+                                samplingLevel="LARGE",
+                                 anti_sample = TRUE)
2017-06-04 11:54:51> anti_sample set to TRUE. Mitigating sampling via multiple API calls.
2017-06-04 11:54:51> Finding how much sampling in data request...
2017-06-04 11:54:52> Downloaded [10] rows from a total of [15].
2017-06-04 11:54:52> Data is sampled, based on 47% of sessions.
2017-06-04 11:54:52> Finding number of sessions for anti-sample calculations...
2017-06-04 11:54:53> Downloaded [30] rows from a total of [30].
2017-06-04 11:54:53> Calculated [3] batches are needed to download approx. [18] rows unsampled.
2017-06-04 11:54:53> Anti-sample call covering 14 days: 2017-05-01, 2017-05-14
2017-06-04 11:54:54> Downloaded [7] rows from a total of [7].
2017-06-04 11:54:54> Data is sampled, based on 53.2% of sessions.
2017-06-04 11:54:54> Anti-sampling failed
2017-06-04 11:54:54> Anti-sample call covering 9 days: 2017-05-15, 2017-05-23
2017-06-04 11:54:54> Downloaded [4] rows from a total of [4].
2017-06-04 11:54:54> Data is sampled, based on 55.7% of sessions.
2017-06-04 11:54:54> Anti-sampling failed
2017-06-04 11:54:54> Anti-sample call covering 7 days: 2017-05-24, 2017-05-30
2017-06-04 11:54:55> Downloaded [10] rows from a total of [10].
2017-06-04 11:54:55> Data is sampled, based on 52.3% of sessions.
2017-06-04 11:54:55> Anti-sampling failed
Joining, by = c("city", "browser")
Joining, by = c("city", "browser")
2017-06-04 11:54:55> Finished unsampled data request, total rows [13]

当我在自定义请求中检查相同的数据时，我看到了类似的采样



知道为什么即使 session 计数远低于限制，我也会得到采样结果？

Answer 1

尽管 https://issuetracker.google.com/issues/62525952 的 session 数很少，但 Google 有一张关于采样的罚单