Proportion scores

[Humphrey Paulie]

Thanks for your comments
  I have several tests that have different number of items and consequently different maximum scores. Some scores are out of a total of 25 some 16 and some 7.
  When I report descriptive statistics such as mean, max. and min. for the tests in different samples because of this difference in the maximum possible score, it’s rather difficult to interpret which test is hard and which is easy.
  How in SPSS can I get proportion scores and report the descriptive stats. on the basis of these proportions scores?
  Cheers
  Anthony



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[Richard Ristow]

At 05:46 AM 10/30/2006, Humphrey wrote:

>   I have several tests that have different number of items and
> consequently different maximum scores. Some scores are out of a total
> of 25 some 16 and some 7.
>    How in SPSS can I get proportion scores and report the descriptive
> stats. on the basis of these proportions scores?

As simple as this, or is it a more complicated problem? Suppose you
have five tests, the scores are variables SCORE1 to SCORE5, contiguous
in the file. I'm making up the maximum scores for each test. Code not
tested.

NUMERIC Proprtn1 TO Proprtn5 (F5.3).

DO REPEAT
     SCORE    = SCORE1 TO SCORE5
    /MAXIMUM  =  7 25 16 16 25
    /PROPORT  = Proprtn1 TO Proprtn5.
.  COMPUTE PROPORT = SCORE / MAXIMUM.
END REPEAT.

Then, whatever statistics you like on the proportions.