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DIDSR / iMRMC

iMRMC: Software to do multi-reader multi-case analysis of reader studies
http://didsr.github.io/iMRMC/
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Converting AUCs to d' #156

Open mtrevin5 opened 5 years ago

mtrevin5 commented 5 years ago

Hi, I have been trying to convert the AUCs generated from the MRMC variance analyses to d' values using d'=√2z(AUC). However, those d's aren't equivalent to d′s calculated from d'=z(H)−z(FA). I had assumed they would be the same but would you have any insights as to why they aren't?

Thank you, Melissa

brandon-gallas commented 5 years ago

Hi Melissa, Your notation is pretty sparse, but my first reaction is that the relationship only holds if the scores are continuous, Gaussian, and have the same variance across the diseased and non-diseased groups.

I hope that helps. Brandon