Google Analytics API 何时将 ga:adCost 清零？有解决方法吗？
https://www.google.com/analytics/feeds/data?ids=XXX&dimensions=ga%3Adate%2Cga%3AreferralPath&metrics=ga%3AadCost&filters=ga%3AadCost%3E0&start-date=2011-04-21&end-date=2011-05-05&max-results=50
我没有得到任何结果。移除过滤器不会改变结果。如果删除 ga:referralPath，我会得到预期的结果，其中有许多广告费用非零的记录。其他广告系列维度都可以，例如 ga:source 和 ga:medium，但显然 ga:adContent 也不好。
至少还有一个人也看到过非常类似的行为（博客在这里）。我认为这可能是由于采样和舍入造成的，但它在非常小的日期范围内仍然存在。
有解决方法吗？ ga:adCost 不允许与 ga:transactionId 一起使用，这是我所知道的唯一唯一标识符，甚至仅适用于进行购买的客户。
Good afternoon. The ga:adCost metric and the ga:date and ga:referralPath dimensions are compatible, according to the reference doc. But when I query for these three values:
https://www.google.com/analytics/feeds/data?ids=XXX&dimensions=ga%3Adate%2Cga%3AreferralPath&metrics=ga%3AadCost&filters=ga%3AadCost%3E0&start-date=2011-04-21&end-date=2011-05-05&max-results=50
I get no results. Removing the filter does not change the outcome. If I remove ga:referralPath, I get expected results, with many records with non-zero ad cost. Other Campaign dimensions are OK, such as ga:source and ga:medium, though apparently ga:adContent is also no good.
At least one other person has seen very similar behavior (blog here). I've considered that it could be due to sampling and rounding, but it persists for very small date ranges.
Is there a workaround? ga:adCost is not allowed with ga:transactionId, which is the only unique identifier of which I'm aware, and even that only applies to customers who make a purchase.
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我认为问题是由于 Google Analytics（分析）中没有记录 AdWords 访问的推荐路径。如果您想了解 AdWords 访问来自何处，则需要使用其他广告系列维度（来源、媒介、广告系列、关键字和广告内容）。
I think that the problem is due to there not being a referral path for AdWords visits recorded in Google Analytics. If you want to see where AdWords visits are coming from then you need to use the other campaign dimensions (source, medium, campaign, keyword and adContent).