Date:         Tue, 10 Dec 2002 13:08:39 +0100
Reply-To:     Dirk Enzmann <enzmann@kfn.uni-hannover.de>
Sender:       "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From:         Dirk Enzmann <enzmann@kfn.uni-hannover.de>
Organization: Kriminologisches Forschungsinstitut Hannover e.V.
Subject:      Re: Grading Scale Conversion
Comments: To: "SPSSX(r) Discussion" <SPSSX-L@UGA.CC.UGA.EDU>
Content-Type: text/plain; charset=us-ascii

A more general solution is:

POMP = [(observed - minimum)/(maximum - minimum)]*100.

(POMP = percent of maximum possible)

BTW, in this but also other contexts the following article might be
interesting:

Cohen, P., Cohen, C., Aiken, L.S., & West, S.G. (1999). The problem of
units and the cirumstance for POMP. Multivariate Behavioral Research,
34, 315-346.

Cohen et al. discuss advantages and disadvantages of constructing scores
as sum scores, average item scores, z-scores, and POMPs and show that in
most cases POMPs are cleary to be preferred.

For multi-items scales POMPs can easily created with SPSS syntax. For
example, if you are using a five point Likert scale (1 = minimum, 5 =
maximum) with 15 items and want to allow a maximum of two items with
missing values, the SPSS syntax would be:

compute pomp = ((mean.13(item01 to item15) - 1)/4)*100.

-----------------------------------------------------

Harding Faulk <hfaulk@cheyney.edu> wrote:

> Can anyone out there is SPSS land share with me the your syntax
statement for converting a 4.00 grading > scale to 0-100 grading scale.

--
*************************************************
Dr. Dirk Enzmann
Criminological Research Institute of Lower Saxony
Luetzerodestr. 9
D-30161 Hannover
Germany

phone: +49-511-348.36.32
fax:   +49-511-348.36.10
email: ENZMANN@KFN.uni-hannover.de

http://www.kfn.de
*************************************************