# Reporting d-prime results

I am currently working on research analysing yes/no responses in a recognition memory task. The false alarm rate is quite high so I have performed a d-prime test and collected d-prime values. Now that I have these d-prime values I do not know how to analyse/report these findings as I have a d-prime value for each individual participant. Some papers show a comparison using an ANOVA but I do not know how to conduct this comparison with the d-prime data or if this is what I should be doing, should I be using the mean of my d-prime values? How should I go about reporting my d-prime results?

• If you have updated information, edit the current post. Does the below answer help you? – AliceD Mar 13 '20 at 9:53

## 1 Answer

d-prime values are usually fairly well normally-distributed. So you can use any parametric test relying on the normality assumption (in facts you should always z-transform fractions before to use a parametric test on them). If you have only 2 conditions you can use a classical t-test. From your question it seems you have only 1 value per participants so that would probably be an independent t-test. If you have more than 1 comparison an ANOVA would be the typical test to use.

For reporting results it is a bit tricky. d-primes are not that intuitive for people. So you might want to report fraction correct in the text, but run your tests on d-primes. For the same reason you might want to plot your results as fractions. Below is an example of wording (but refer to a statistical textbook for conducting and reporting statistical tests). Note that it is fine to report means and standard deviations of fractions. However parametric tests should always be conducted on z-scores. I know people use fractions in tests all the time but it is wrong.

The mean recognition rate increased from NN% to NN% between the conditions ... and ..., for a mean improvement of NN ± NN% (SE). This difference was significant in an independent t-test on z-transformed recognition rates: t(N)=N, p

• Can you add sources to your answer? – AliceD Mar 13 '20 at 10:30