Hello, I am conducting the linear mixed effects analysis by SPSS. I have few questions and highly appreciate your help: 1- How can I compare two linear mixed effects models to find the best model? I've been told to use the t-test for coefficients but how? What is the SPSS command? I need to compare one simple mixed effects model with the Univariate one. 2- How can I obtain the fitted values for my model? 3- How can I plot my mixed effects model in a way that it also shows confidence interval. I plotted the predicted value versus my independent variable but it looks like the linear line and it does not show me the confidence interval. Thanks so much for your help

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8/23/2016 7:43:24 AM

On Tue, 23 Aug 2016 00:43:24 -0700 (PDT), Mojy <mgmoghaddam@gmail.com> wrote: >Hello, > >I am conducting the linear mixed effects analysis by SPSS. I have few questions and highly appreciate your help: > >1- How can I compare two linear mixed effects models to find the best model? >I've been told to use the t-test for coefficients but how? What is the SPSS command? > >I need to compare one simple mixed effects model with the Univariate one. For a nested comparison, you have an F test from the change in mean-square and change in d.f. If you are using regression, that is among the options -- after entering a Step. For non-nested comparisons, folks usually use AIC or BIC. > >2- How can I obtain the fitted values for my model? Look at program options? > >3- How can I plot my mixed effects model in a way that it also shows confidence interval. I plotted the predicted value versus my independent variable but it looks like the linear line and it does not show me the confidence interval. > >Thanks so much for your help There is more activity in the SPSS mailing list at SPSSX-L. I think there are versions of the same question, which you might find by searching the list at Nabble -- even without joining. For info about joining SPSSX-L, go to http://spssx-discussion.1045642.n5.nabble.com/ and click on the More Options link near the top of the page.

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8/23/2016 10:53:10 PM

On Tuesday, August 23, 2016 at 6:53:14 PM UTC-4, Rich Ulrich wrote: > On Tue, 23 Aug 2016 00:43:24 -0700 (PDT), Mojy <mgmoghaddam@gmail.com> > wrote: > > >Hello, > > > >I am conducting the linear mixed effects analysis by SPSS. I have few questions and highly appreciate your help: > > > >1- How can I compare two linear mixed effects models to find the best model? > >I've been told to use the t-test for coefficients but how? What is the SPSS command? > > > >I need to compare one simple mixed effects model with the Univariate one. > > For a nested comparison, you have an F test from the > change in mean-square and change in d.f. If you are using > regression, that is among the options -- after entering a Step. I suspect the OP is using the MIXED procedure, in which case it will be a likelihood ratio test (on the change in -2LL) rather than an F-test on the change in R^2. > > For non-nested comparisons, folks usually use AIC or BIC. Agreed. > > > > >2- How can I obtain the fitted values for my model? > > Look at program options? > > > > >3- How can I plot my mixed effects model in a way that it also shows confidence interval. I plotted the predicted value versus my independent variable but it looks like the linear line and it does not show me the confidence interval. > > > >Thanks so much for your help > > > There is more activity in the SPSS mailing list at SPSSX-L. > I think there are versions of the same question, which you > might find by searching the list at Nabble -- even without > joining. > > For info about joining SPSSX-L, go to > http://spssx-discussion.1045642.n5.nabble.com/ > > and click on the More Options link near the top of the page. Yes, that mailing list is far more active than this newsgroup these days. HTH.

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8/24/2016 5:09:28 PM