[add-sub-mul-div]

There should be a term (if there isn't already) for the phenomenon of bias or flat out incorrect conclusions caused by sourcing whatever data happens to be easy/convenient rather than a complete or more apt data set.

[thenickdude]

Sampling Bias: https://en.wikipedia.org/wiki/Sampling_bias

[ziml77]

Wouldn't the ones you can't use the app to order from be outliers?