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Analyse Accuracy, Hits and False Alarms in e-prime

It's the first time for me to do analyses with e-prime, and I have to analyse some data from an experiment. The data are, at the moment, in e-prime. I'd like to have the accuracy, the hits, and the false alarms for every subject. When I am in the anaylse window:

  1. Accuracy: I drop the subjects into the rows, and the Target ACC into the Data window. But do I take the ACC mean or the ACC count?

  2. Hits: Isn't it the same as accuracy? And, if not, what is the difference?

  3. False Alarms: do I just count them? How can I make it then comparable over different tasks (some tasks have more trials than the others).