Urgent: covariance parameter estimates are all zero (i.e. estimate, Std error, confidence interval)
Dear All,I have been analysing a two factorial (3*4) RCBD repeated measures design by using the mixed model approach in JMP. Above is a section of the report I got. Why are the estimates zero. Other information include about the analysis include:1. 14 continuous variables measured four times at unequal time periods2. All the three covariance structures I tried (AR1, Toeplizt and spatial power) had...