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A comment on The new dot com bubble is online advertising (2019). Parent comment

Re:The new dot com bubble is online advertising (2019) by auggierose on Saturday October 02, 2021 @04:43AM (#28727089)
I don't know what lift tests are. It should be easy enough to devise a tool for measuring incremental ROAS under the following assumptions: a) all purchases happen online; b) I have a complete history of ad impressions and ad clicks for each user who made a purchase

As you said yourself, b) breaks down for multiple platforms. It also breaks down if users have disabled tracking.

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Re:The new dot com bubble is online advertising (2019) by disgruntledphd2 on Saturday October 02, 2021 @12:00PM (#28729633)
Lift tests are these things: https://www.facebook.com/business/m/one-sheeters/conversion-...

They are essentially what one needs to measure incremental ROAS of one's advertising.

Now, there are obvious caveats (online, tracking etc) but they're much much better than what's available for other platforms.

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Re:The new dot com bubble is online advertising (2019) by jefftk on Saturday October 02, 2021 @09:45AM (#28728531)
> It also breaks down if users have disabled tracking.

Almost all users who disable tracking also block ads, so you are still correctly measuring the effect of your ad spend.

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