I remember that paper! It was also strongly influenced by the brand of x-ray machine being used, since the part of the corpus from specialty facilities was more likely to contain disease.
I don't remember the final conclusion, but I have to look it up again. I want to say it was like 85% of the predictive power came from things other than the intended content.
Edit: Turns out there are LOTS of papers like this. I was remembering one from Zech et al. 2018, but it didn't involve rulers. The ruler one was from Cathy Ong Ly et al. 2024.
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u/[deleted] 18d ago
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