[colechristensen]

You have to spend quite a lot of time thinking about quality and values. It becomes impossible as the size of the “best slice” you’re seeking gets smaller (top half is much easier than top ten percent, etc)

If your values are “everyone should agree with my opinions” you’ll have a garbage biased data set. There are other values though. Bias free is also impossible because having a definition of a perfectly neutral bias is itself a very strong bias.