Posted by
lsummer on
Jul 15, 2019; 1:23pm
URL: http://spssx-discussion.165.s1.nabble.com/How-to-run-a-GEE-in-SPSS-with-a-Tweedie-distribution-tp5738160.html
Hi,
I like to run a GEE as I have panel data of movement behaviour of people
(per person I have multiple trips, for example the detour ratio). I like to
estimate the effects of the direct distance on the detour ratio, while
taking into account that there might be differences between first trip ..
fourth trip -and so on.
The problem is that detour ratio is often 0, and in a few cases it can be
very high, thus a tweedie distribution is the most appropriate to use. To
start I used a Normal distribution with Identity function, which gave
results (but as expected, not very good ones).
However, I receive an error when I use the tweedie distribution: "There is
at least one invalid case in the last iteration. A case is invalid if there
are errors in computing the inverse identity link function, the
log-likelihood, the gradient, or the Hessian matrix in the iterative
process. Only the iteration history is displayed."
Is there somebody with experience in GEE, tweedie distribution, and SPSS?
Any tips would be of great help!
PS: I originally posted this question on Research gate, where they referred
me to this website.
https://www.researchgate.net/post/How_to_run_a_GEE_in_SPSS_with_a_Tweedie_distributionThank you!
--
Sent from:
http://spssx-discussion.1045642.n5.nabble.com/=====================
To manage your subscription to SPSSX-L, send a message to
[hidden email] (not to SPSSX-L), with no body text except the
command. To leave the list, send the command
SIGNOFF SPSSX-L
For a list of commands to manage subscriptions, send the command
INFO REFCARD