Hi all, we are running a mixed model analysis in Jamovi using the Gamlj module. We have several predictors (both covariates and factors) and are clustering the intercept under the participant (1|participant). Further, we have followed the patients for over a year, hence have several time points. Our question concerns whether it is possible to make jamovi stop as long as a polynomial effect is no longer significant,(which if I am not wrong was possible with HLM software). For example, say we have 4 timepoints. The possible polynomial effects are linear, quadratic, cubic and the fourth order effect. In case the linear and the quadratic effects are significant but the cubic and the 4th order effect are not, is it possible for jamovi to stop testing for significance once it reaches the quadratic effect?

Hope this makes sense.

Annie