Good day all,

I have been tasked with working out the alpha for an ability test which measures only two factors: Median Reaction Time (in ms) and Score based on how many signals were detected (value out of 40).

My question is how do I go about doing this? Previously I've computed the alpha for personality assessments and such but never for an ability test and I have no idea how to do it in SPSS. Would i need to compare the RAW scores to the Norm scores for each of the factors? Any guidance would be greatly appreciated.