External Email - Use Caution Hello Jessica,
please see my inline reponses below. Best regards, Kersten On Mo, 2019-12-02 at 02:48 +0000, Hua, Jessica wrote: > External Email - Use Caution > Hi FreeSurfer Experts, > > I used the longitudinal pipeline and analyzed my data using the > univariate linear mixed effects models. I had a couple of questions: > > 1) The model outputted the F and p values. How do I calculate the > effect size? There are some standardized effect sizes for LME models described in the literature, but none are, as far as I know, included in the lme toolbox, so one would still need to implement them. In my opinion, it's therefore easiest to express the magnitude of changes / differences in terms of unstandardized effect sizes, i.e. the beta coefficients estimated by the model. > 2) How do I plot my analyses? I would like to create a plot for > change in CC volume with eBAC. Below is my model: > > Yij = ß1 + ß2(timeij) + ß3(eBACi) + ß4*estimated eBACi*timeij + > ß5(genderi) ß6(intracranial volumei) + b1i + b2i(timeij) + eij. That really depends on how your plot should look like, and may require some custom Matlab programming. For 'spaghetti'-style plots (i.e. a bunch of individual slopes), have you explored the 'lme_timePlot' function? > Thank you for your help! > > Jessica > > --- > > Jessica Hua, M.A. > Cognitive and Emotional Control Lab > Doctoral Candidate Clinical Psychology > University of Missouri > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
