There are times when what we see right there in front of us tells a simple and clear story. The evidence in front of us is so certain, so obvious, it is easy to understand.

But, it’s always a good idea to look a little further. It might be the things you haven’t seen – that are very much a part of the story – that will complete the picture, and give you real understanding.  

Sometimes the hidden things, the ones you don’t see, make all the difference.
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Data Scientist, Steve Nouri, provided the following list of references.
Credits:
Wald, Abraham. Archived 2019-07-13 at the Wayback Machine. Center for Naval Analyses.

Wallis, W. Allen (1980). "The Statistical Research Group, 1942-1945: Rejoinder". Journal of the American Statistical Association.

"Bullet Holes & Bias: The Story of Abraham Wald". mcdreeamie-musing

"AMS :: Feature Column :: The Legend of Abraham Wald". American Mathematical Society

'How Not to Be Wrong' by Jordan Ellenberg (released in 2014)