Job Evaluation Instrument

shanujas.v@gmail.com
Hi all
My research area is job evaluation. There are 3 methods for assigning points among factor degrees. (1) Subjective assigning points (2) Statistical method of assigning points among factor degrees (3) Geometric progression method.
Anybody knows the statistical method of assigning points among factor degrees? Is it through job evaluation instruments having scales? what kind of statistical analysis are possible? How can scaling be done? How can points be divided among factor degrees quantitatively? How do the reliability and validity be checked?
Please help me and make me clear the statistical method of assigning points among factor degrees.
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