Ok, I'm now being overly-pedantic :) I don't think alexa "scales up." If they do, then, you're right, there is uncertainty. If they don't, I don't think ther

Ok, I'm now being overly-pedantic :) I don't think alexa "scales up." If they do, then, you're right, there is uncertainty. If they don't, I don't think there's a concept of an error bar here. They track how many people go to what sites. Aside from a few dropped packets here or there, there is no uncertainty in that measurement. Therefor, there is no way to measure that sort of error bar. (Right?)