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Mixed Effects 3. Type the following Formula: weight ~ SSlogis(Time, Asym, xmid, scal) This specifies that we want to predict weight by a function SSlogis of the variables Time, Asym, xmid, and scal. The SSlogis function is a self-starting function used to specify the nonlinear model, as well as provide initial estimates to the solver. 4. Specify starting fixed effect parameter estimates in the Parameters (name=value) field: fixed=c(18, 52, 7.5) 5. Specify that Asym, xmid, and scal are the fixed effects variables by typing the following formula in the Fixed field under Effects: Asym + xmid + scal ~ 1 6. Specify that Asym, xmid, and scal are the random effects variables and that Plot is the grouping variable by typing the following formula in the Random field under Effects: Asym + xmid + scal ~ 1 | Plot 7. Click OK. A summary of the fitted model appears in the Report window. 309
