What are time reversal and factor reversal tests?( fisher's index number as an ideal method)
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https://www.meritnation.com/ask-answer/question/what-is-time-reversal-test-and-factor-reversal-test/academics/6853599
https://www.meritnation.com/ask-answer/question/why-fishers-index-numbr-is-said-to-be-an-ideal-indx-number/bba/6870463
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