On Wednesday, March 21, 2018 at 3:30:48 PM UTC+1, Boris Zbarsky wrote:
> The point is to gather data on how this behaves in the wild.  If the 
> study is opt-in, then you have to try to figure out what part of the 
> effect you're seeing (if any) is just selection effects.
>From my understanding of Patrick's original message, the control in this study 
>isn't "the 50% of Nightly users who don't have DoH enabled", but instead the 
>existing DNS calls on each and every resolve:

On Saturday, March 17, 2018 at 11:51:02 AM UTC+1, Patrick McManus wrote:
> This initial test is focused on performance feasibility assessment and we
> won't actually be using the DNS data returned from the DoH server (i.e. the
> traditional DNS service is used in parallel and only those answers are used
> - the code calls this shadow mode.) 

While yes, self-selection bias could still influence the results, it isn't 
obvous to me at least that it would be significant.

> So this doesn't _need_ to be opt-out, as long as you're willing to not 
> believe any data it produces.  But then what's the point?

Thats seems like an exageration.


-Tom
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