How search impression share is calculated in Google Adword?

by Mani   Last Updated February 25, 2016 01:01 AM

As per Google Adword,

Search Impression share is the impressions that you’ve received on the Search Network, divided by the estimated number of impressions that you were eligible to receive.

I want to know how the "eligible impression share" is calculated in google adword. If someone explain with example, It will be great.



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