Well, the correct puralization would "biased data". With data, the method of collection matters a great deal in determining the amount of bias inherent in your

Well, the correct puralization would "biased data". With data, the method of collection matters a great deal in determining the amount of bias inherent in your dataset. The implication of flipping the expression around is that poorly collected data isn't really data (which is silly). That is a bit silly, but so is the implication of the original expression which implies that simply having more anecdotes resolves issues of data bias.