i'd say its often too wooly to even call a single data point, but in other cases its obviously very many.
if 1000s of people are telling the same story, thats 1000s of potential data points... they lose value from being ill defined rather than being small in number.
> if 1000s of people are telling the same story, thats 1000s of potential data points... they lose value from being ill defined rather than being small in number.
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They don't exist in isolation though. If thousands are telling the same story and there is no independent corroboration then it's more likely that one person told a story and thousands repeated it.
The bias most commit is thinking that a data point is more valuable because you know more about it.
Just because you know the story behind it doesn't mean it's more important.