There’s the bias between users willing to share that data and those not willing. All sorts of correlations could be hiding there.
I can’t find out what the rate of refusals are, but I’d guess them to be rather low, maybe 10% at most. The survey is incredibly easy to perform and very transparent about colleted data.
The important thing to realise is that the survey is very consistent, so while the baseline may have some bias, the trends are very representative.
There’s the bias between users willing to share that data and those not willing. All sorts of correlations could be hiding there.
I can’t find out what the rate of refusals are, but I’d guess them to be rather low, maybe 10% at most. The survey is incredibly easy to perform and very transparent about colleted data.
The important thing to realise is that the survey is very consistent, so while the baseline may have some bias, the trends are very representative.