Likert scale and zscores (transformation)

#1
Hello everyone,
I am facing a really interesting issue. I am not strong at SPSS so do not judge me too harsh please. I am working on ientifying predictive validity of a psychometric assessment. Two of them.
I have the following type of data:
1. Job performance evaluation - 5point Likert scale
2. Psychometric assessment presented with zscores.
3. Another psychometric assessment results are presented in also Likert scale from 3 to 12. Why 3 to 12. because each scale consisted of subscales (7 scales each 3 subscales, each of subscales to be evaluated based on 1-4 Likert Scale).

So now I need to compare 1 to 2 and 1 to 3. then compare the results to each other to see which test had higher predictive validity.

Do I need to transform data? because I think that I cannot run SPSS with two different types of data such as zscores and Likert scale data.

What would you recommend?

BR
Marine
 

Karabiner

TS Contributor
#2
What exactely do you mean by "compare", what do you want to achieve with your analysis?

And what do you mean by z scores here, are these normative values?

With kind regards

Karabiner