I know this is the case when clicktype is included in the breakdown - in 
that case impressions and average position will have different values.

It's easy to understand how that can happen:
With clicktype you can get separate values for sitelink impressions. So, 
for instance a report may state that the ads themselves got 20 impressions, 
and sitelinks got 4 impressions. The aggregated report will just show 20 
impressions.

If you find another reason, please share it with us!




On Tuesday, April 4, 2017 at 7:20:09 PM UTC+2, Vikram Tiwari wrote:
>
> The issue is:
>
>
> - When API is queried for aggregated data, sum of a numerical column 
> (impressions, clicks, cost etc) is X
> - When API is queried for data with multiple breakdowns (ad, adset, 
> campaign and more), the resultant sum is X +/- n
>
> The reason for the discrepancy of n is unknown but is suspected/theorized 
> to be:
> - An element from breakdown (ad, adset or campaign) was deleted hence 
> during breakdown that data is not available, but when the data is queried 
> as aggregate that data is present and thus the difference.
>
> Any comments?
>
> Normally the difference is in the range of +/-10 so something else might 
> be in play here as well.
>

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