Re: question about measure creation statistics
Posted by
ANDRES ALBERTO BURGA LEON on
Nov 18, 2011; 8:26pm
URL: http://spssx-discussion.165.s1.nabble.com/question-about-measure-creation-statistics-tp5002888p5005513.html
KR-20 is for dichotomous scored items,
asuming all have the same dificulty
Does all your items have the same dificulty?
Andrés
Mg. Andrés Burga León
Coordinador de Análisis e Informática
Unidad de Medición de la Calidad Educativa (UMC)
Ministerio de Educación del Perú
Av.de la Arqeuología s/n (cuadra 2)
Lima 41
Perú
Teléfono 615-5840 - 6155800 anexo 1212
http://www2.minedu.gob.pe/umc/
SPSS can calculate just about anything. Please
provide formula for KR-21
coefficient (I have not studied psychometrics for about 20+ years) and
don't
have the time to google it.
mmiesner wrote:
>
> Hello-
> I'm creating a measure that currently has 20 items. 18 of these items
are
> multiple choice, 4 possible answer questions. 2 of the items have
7
> possible answers. All of the items are covering the same broad area
> (knowledge of psychological disorder criteria).
>
> I ran cronbach's alpha and the score was .78.
> I talked to my advisor, who said this was incorrect and I should have
run
> KR-20. I did some reading, and two things appear to be true.
>
> First, that in fact, I should be using KR-21 since the answers are
not
> dichotomous.
> Second, that there is no way to do this in SPSS.
>
> Would LOVE some guidance.
>
> Michael
>
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