Posted by
Marta García-Granero on
Nov 27, 2006; 2:58pm
URL: http://spssx-discussion.165.s1.nabble.com/Linear-trend-test-when-using-logistic-regression-model-tp1072347p1072348.html
Hi Margaret
Monday, November 27, 2006, 2:04:05 PM, You wrote:
MM> Using SPSS, is it possible to perform a chi-square test of
MM> linear trend within the context of a binary logistic regression
MM> model? The idea I have in mind here can best be illustrated by an
MM> example. Suppose I wish to determine whether there is a linear
MM> association between the factor level of exposure (in categories)
MM> and the dependent variable disease status (with categories
MM> present or absent) whilst adjusting for the effect of other
MM> factors such as family history of disease' and gender.
use /CONTRAST (LevelOfExposure)=Polynomial
It will decompose LevelOfExposure in k-1 (k:Nr. of levels) variables.
The first one will test the linear trend, the second one the quadratic
term, and so on.
MM> I suspect that that such a test exists but relevant output
MM> is not forthcoming from the output for a binary logistic
MM> regression analysis within SPSS (on assuming the 'point and click'
MM> approach).
--
Regards,
Dr. Marta García-Granero,PhD mailto:
[hidden email]
Statistician
---
"It is unwise to use a statistical procedure whose use one does
not understand. SPSS syntax guide cannot supply this knowledge, and it
is certainly no substitute for the basic understanding of statistics
and statistical thinking that is essential for the wise choice of
methods and the correct interpretation of their results".
(Adapted from WinPepi manual - I'm sure Joe Abrahmson will not mind)