If you re-run the poisson model using only predictors that appeared
significant in the larger model, you may find that the previously significant
predictors are now not all significant. You must check. Simply rerun the model using
only those predictors that were significant and check to see if that still
remain the case. If it does, then type -predict mu, mu- to get the predicted
counts, if that is what you want. However, I myself double check predictors,
especially ones that have p-values close to .05, with the likelihood ratio
test. The latter test is more reliable than Z-, t-, or Wald tests.
Joe Hilbe
=========================================================
Hi All
I have a question on predict command.
If I run a poisson regression such as
poisson absdays male black hispanic bluecollarworkers
nohealthinsurance backpain comorbidconditions
where all the independent variables are dummy
variables.
absdays=constant + b1*male + b2*black + b3*hispanic +
b4*bluecollarworkers + b5*nohealthinsurance +
b6*backpain + b7*comorbidconditions
If from the output only black, backpain, and
comorbidconditions were statistically significant, can
I run the predict command to obtain
the predicted number of absdays using only the
significant variables?
In otherwords can I get the predicted absdays as
constant + b2*black + b6*backpain +
b7*comorbidconditions
I know one option is to use the generate command but I
would like to know if we can do this using predict
command too.
Thank you for your time.
Regards
Anju
____________________________________________________________
Anju Parthan,
Doctoral Candidate,
The University of Texas at Austin, PHAR-PHARMACY ADMIN
1 UNIVERSITY STATION A 1930, AUSTIN, TX-78712
Tel: (512) 459-4942; Fax: (512) 471-8762
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