Posted by
Ryan on
Sep 23, 2011; 12:35am
URL: http://spssx-discussion.165.s1.nabble.com/Multilevel-binary-logistic-regression-with-SPSS-19-tp4828072p4832001.html
Hey Bruce,
A couple of reasons:
(1) GENLINMIXED uses pseudo-likelihood (PL) methods to estimate the
model parameters. PL methods have been shown to produced biased fixed
effects estimates, particularly when modeling correlated binary
response data. Instead, one should consider an integral approximation
method or perhaps even a Bayesian approach.
(2) GENLINMIXED does not have what would be equivalent to the /TEST
sub-command in the MIXED procedure. I don't want to have to fit a
model various times to obtain specific contrasts of interest with
respective confidence limits and p-values, especially if it takes
several hours for a model to converge. If I'm employing a random
effects logistic regression, for instance, I want to be able to obtain
odds and risk estimates at each combination at each level of the
categorical predictor variables and at specific values of covariates
with confidence limits. Suppose I want to compare the mean of two
levels of Factor A to the mean of a third level of Factor A? All of
these sorts of contrasts can be easily employed with fairly
straightforward statements using other generalized and/or nonlinear
mixed procedures in other stats packages. Until SPSS catches up, it
just isn't worth it for me.
Having said all of that, for purposes of learning the basics of
generalized linear mixed models or if one wants to run a preliminary
analysis of say a random effects Logistic or Poisson regression, then
I suppose GENLINMIXED could be useful. But, if the stakes are high and
you need a flexible program with top notch estimation methods, you
will have to go elsewhere.
My 2 cents.
Ryan
On Thu, Sep 22, 2011 at 2:53 PM, Bruce Weaver <
[hidden email]> wrote:
> Hi Ryan. I've just started using v19, and have not yet tried GENLINMIXED, so
> I have yet to experience the /pleasures/ of the model viewer. I hope one
> can at least use OMS to send desired bits of output to another dataset.
>
> But...that's not why I'm responding. I'm interested in knowing the other
> reason(s) that motivated you to stop using GENLINMIXED. Thanks.
>
> Bruce
>
>
>
> R B wrote:
>>
>> Craig,
>>
>> I haven't figured out how to turn off the model viewer. Frankly, I
>> stopped using GENLINMIXED in part because of this issue. Do you have
>> access to SAS? If so, consider the GLIMMIX procedure. Not only is the
>> output much easier to examine, but the actual proc has many more
>> options and has better estimation methods.
>>
>> Ryan
>>
>> On Wed, Sep 21, 2011 at 5:55 PM, Abbott, Craig (NIH/NICHD) [E]
>> <
[hidden email]> wrote:
>>> I am trying to do a multilevel binary logistic regression with SPSS 19
>>> using
>>> GENLINMIXED.
>>>
>>>
>>>
>>> The output uses the model viewer—something new to me and so far I’m
>>> finding
>>> it a nuisance.
>>>
>>>
>>>
>>> Can I turn the model viewer off and get output as pivot tables?
>>>
>>>
>>>
>>> If not, can I edit the model viewer tables such as increasing the number
>>> of
>>> decimal places?
>>>
>>>
>>>
>>> Has anyone successfully replicated examples 14.2 or 14.3 from Snijders &
>>> Bosker, Multilevel Analysis (1999) using
>>>
>>> SPSS 19 GENLINMIXED?
>>>
>>>
>>>
>>> --craig
>>>
>>>
>>>
>>>
>>>
>>>
>>
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>
> -----
> --
> Bruce Weaver
>
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>
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> "When all else fails, RTFM."
>
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