[pminimax]

I wouldn't worry about one datapoint out of 35,000 messing up the stats.

[KajMagnus]

That's a lot! Now I noticed: "I am tracking local time of day[...] infer whether night mode [...] any aggregate effects."

So you've thought about that already :- ) (it's evening here)

[Moru]

I would guess the hackernews crowd has a higher percent of bluefilter installs since that is a very common topic. Probably also more agressive settings for the blue filter.