Not SPSS: 5-point versus 6-point scales

[Salbod]

I’m trying to create an attitude scale. When it comes to item scales, e.g., 5-point versus 6-point what do I need to consider? Is there a reference where this is discussed? I can see that increasing the item scale will yield more item variance, but I would think that I would need more participants then?  Does removing the neutral choice influence the response pattern on items (e.g., skewness)? A reference I could sit back with would be ideal.

Any suggestions would be greatly appreciated.

Stephen Salbod, Pace University

[Ryan]

Stephen,

Take a look at this page for two approaches you might consider in determining the number of response options:

http://en.wikipedia.org/wiki/Polytomous_Rasch_model

As you can seen, these are extensions of standard binary logistic regression. No time to elaborate.

Ryan

On Tue, Sep 30, 2014 at 7:15 AM, Salbod <[hidden email]> wrote:

I’m trying to create an attitude scale. When it comes to item scales, e.g.,
5-point versus 6-point what do I need to consider? Is there a reference
where this is discussed? I can see that increasing the item scale will yield
more item variance, but I would think that I would need more participants
then?  Does removing the neutral choice influence the response pattern on
items (e.g., skewness)? A reference I could sit back with would be ideal.

Any suggestions would be greatly appreciated.

Stephen Salbod, Pace University




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