Re: CTables Test of Significance

Posted by Kornbrot, Diana on Mar 28, 2017; 7:16am
URL: http://spssx-discussion.165.s1.nabble.com/CTables-Test-of-Significance-tp5734016p5734018.html

think you can use cross tabs with Mantel Hanzel option with subjects

GEE is fine recommend you try probit as well as logit

GENLINMIXED only has multinomial option - not ordinal logit,

also i claims not to do mixed for repeated measu

as far as I can see, however you can run both probit and logit multinomial and see which give you lowest Aikake or Bayes goodness of fit. Bet its probit - but would be interested to know

Bruce if you know how to get ordinal or even multinomial logit in genlinmixed - please tell us, WITH SCRIPT. in v23 it said not -  multinomial not available

SPSS is DIRE fro ordinal it won’t even give you the means in either GEE or regression ordinal [plum] 

as a side line recession ordinal is preferable for between designs as you can fit scale as well as location

best

Diana

On 28 Mar 2017, at 02:59, Bruce Weaver <[hidden email]> wrote:

To summarize:

1. You have an ordinal dependent variable (rating).
2. You have one categorical explanatory variable (Jeep Model, with levels
Compass, Wrangler, etc.).
3. Each respondent rates each model, so you have repeated measures.

One way to address your question is via GENLIN, using a multinomial error
distribution with a cumulative logit (CUMLOGIT) link function, and with
generalized estimating equations (GEE) to account for the correlated nature
of the repeated measures.  (Another way would be to estimate a multilevel
model via GENLINMIXED, with Jeep Model at level 1 and Respondent at level
2.)

I am not a CTABLES expert, but when I look it up in the FM, here is what I
find under the heading of Significance Testing:

"Custom Tables can perform the chi-square test of independence and pairwise
comparisons of column
proportions for tables that contain at least one category variable in both
the rows and the columns."

The Chi-square test of independence assumes one observation per respondent,
and is not appropriate for your repeated measures data.

HTH.



WillBaileyz wrote

Monday morning blank ...

I have a set of variables say different Jeep models like Compass,
Wrangler,
Cherokee .... and for each a respondent does a rating from Very Satisfied
-
Very Unsatisfied (Ordinal from 1 to 5) and want to do a test of sig
between
the rating for each model. 

For the life of me am blanked. In Ctables can set that x'tab up but since
I
reposition the response codes from the brand to the column test of sig
want
work

What am I missing

Running V24.0.0.1




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