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multilevel log-binomial regression [message #25263]

Sun, 25 September 2022 01:31

jessy
Messages: 8
Registered: August 2022

Member

Dear all,
I am currently running my thesis, comparing the performance of binary logistic, modified Poisson and log binomial models in determining factors associated with teen pregnancies.

I am trying to fit a multilevel log-binomial model in order to calculate the prevalence (risk) ratio (rather than the odds ratio) for a clustered binary outcome and am running into an unexpected error.

using the glm command, one can correctly specify a single-level log-binomial model as

glm depvar indvar, family(binomial) link(log) eform

However, when specifying the same model as a 2 level-level, random intercept model using meglm

meglm depvar indvar || village: || household: , family(binomial) link(log) eform

I get the following error,

link log is not allowed with family bernoulli
r(198);

I am running Stata 14, so am wondering if there is an extra package i need to install to be able to run the log-binomial model at 2 levels.
or it is simply a limitation of the meglm command. Any insights or suggestions would be much appreciated

Thanks!!

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Re: multilevel log-binomial regression [message #25273 is a reply to message #25263]

Mon, 26 September 2022 16:35

Bridgette-DHS
Messages: 3230
Registered: February 2013

Senior Member

Following is a response from DHS staff member, Tom Pullum:

The help for meglm includes this:

/index.php?t=getfile&id=1943&private=0

This table says that the combination of binomial error and log link is not allowed. You say that the combination worked for you with a single-level glm model, and I am sure I have been able to run it as a single-level glm model. I'm guessing that you have found a difference between glm and meglm and there's nothing you can do to get around it. I would shift to a negative binomial or Poisson model. They will probably be indistinguishable in the estimates they produce.

Attachment: regression.png
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Re: multilevel log-binomial regression [message #25275 is a reply to message #25273]

Tue, 27 September 2022 02:16

jessy
Messages: 8
Registered: August 2022

Member

thanks dear, this is help ful and confirms my thoughts around using a log binomial model at 2 levels.

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