Thanks for the links; they're some interesting reading. I'll have to send an email to Ars asking why they use NetMarketshare (and maybe do a piece comparing them with StatCounter). The weighting based on the CIA factbook seems, to me, to indicate that IE is used more heavily in less connected countries (since they get pulled up). And yes, it is weird to weight your data, but, IMO, no less weird than just ignoring missing data (which would seem to be what SC does). At least they both are
> If you have any other enlightening views about why the bias, please let us know.
I suppose if and when Ars does a NM/SC comparison article would help with this.
> Finally, given that I was talking about dwindling Firefox market share, which is confirmed by all sets of data, this is a very unnecessary discussion, entertaining as it may be.
Well, seeing as my comment spawned this subthread, I agree that Firefox isn't looking strong in any of these datasets. I was more surprised at the difference between the stats I had seen before. Plus, it's not like I have much of a horse in the race as a developer of Uzbl (which will forever be relegated to a fraction of "Other").