What is the method to compare the performances on two different cognitive tests (that measure different cognitive functions) of the same or different group(s)?
As two cognitive tests are inherently different from each other and many a times, have different parameters.
It will be helpful if anyone can direct me to some useful references.
Thank you.
See these links:
https://www.ncbi.nlm.nih.gov/books/NBK305230/
Article A comparison of methods for measuring cognitive change in older adults
Article Comparing Traditional and Digitized Cognitive Tests Used in ...
Dear Raj Kumari Sharma.
if the results on such tests can the translated into an interval scale, then they can be compared, for example, via a t student test, which is described in any book on statistics.
I hope this is of some help to you.
If they are norm-referenced tests that yield standard scores it is easy. Just put the results on the same scale (deviation IQ, z score, or whatever) and compare directly. Remember, all standard scores are interchangeable - conversion tables are easily found. Differences are significant/interpretable based on the standard errors of measurement of the two tests. Usually those figures are reported in the Manuals; if not, they can be calculated easily from the reliability coefficients and standard deviations. The only caveat here is that the standardization samples may not be comparable, so exercise due caution in what you assert. That is, one test developer may inadvertently have recruited an especially able (or weak) set of people on whom the norms are based.
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