how can i calc QualityScore

[web david]

I want to calculate qualityScore in keyword like avg position by (SUM(Impressions * AveragePosition) / SUM(Impressions)) ,

so whats the formula about qualityScore 。thank you advance.

[Shwetha Vastrad (AdWords API Team)]

Hi, 

Quality Score is an aggregated estimate of your overall performance in ad auctions. There isn't a direct formula which you can use to calculate this value. You need to include the QualityScore field in the selector and download the Keywords Performance Report to retrieve the quality score of your keywords. 

Regards,

Shwetha, AdWords API Team.