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Are the ability estimates given by fscores in mirt and factor.scores in ltm Z-scores? That is, so long as the relevant ability can be assumed to be normally distributed in the population, is someone with an ability estimate of 0 estimated to be of mean ability, someone with an ability estimate of 1 estimated to be one standard deviation above mean ability, and so forth?

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The way these scores are estimated is somewhat complicated, but I think there is no reason you can't interpret them as 'Z-scores'. So, in short, yes.

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