Write a few sentences with references to describe what a Scale Variable is in SPSS.
Explain the rationale behind transformation of scale variable into Binary Variable with reference to relevant literatures.
Explain the rationale behind transformation of continuous (Scale) variable into ordinal variable with reference to relevant literatures.
Explain the rationale behind transformation of Ordinal variable into Binary variable with reference to relevant literatures.
Explain the rationale behind transformation of Nominal variable into a new Nominal Variable with fewer categories. Please do make reference to relevant literatures to explain the reason why all this changes takes place in SPSS.