Re: Comparing different scales

I like Rich's suggestion about transforming the reaction time variable.

But, once that's done, I'm not yet convinced that there's a problem
with subtracting z scores.

True, with z scores you lose track of whatever mean difference might
exist between explicit and implicit self-esteem were both constructs
measured on a common scale. That is, suppose, averaged over all
people, implicit self-esteem is x "units" higher than explicit
self-esteem. You'd lose that information with z-score subtraction.

But if you're trying to correlate (ROSE - ISE) with other variables,
such an overall mean difference doesn't matter, does it?

A similar argument could be made for subtracting ranks on the two
variables.
--
John Uebersax PhD

.

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