The impression share lost because your ad was not displayed due to its ad rank. If impressions share is the percent of time your ad was displayed out of all eligible impressions, then search lost IS is the percent of time your ad was not displayed.

The impression share lost because your ad was not displayed due to its ad rank. If impressions share is the percent of time your ad was displayed out of all eligible impressions, then search lost IS is the percent of time your ad was not displayed.
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