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MomentMonster90
MomentMonster90
Level I

Urgent: covariance parameter estimates are all zero (i.e. estimate, Std error, confidence interval)

Jun 13, 2022 08:53 AM (1285 views)

MomentMonster90_0-1655124116018.png

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 periods

2. All the three covariance structures I tried (AR1, Toeplizt and spatial power) had similar fixed effects but of different magnitudes

3. However for three variables the repeated effects covariance parameter estimates were zero; two of these variables were angular (i.e. in degrees) and the other ratio ( in the range of zeros (0.2 to 0.9)

Please I want to know why the estimates are zero.

NB: there was no random effect as recommended by the JMP instructions I had.

Thank you in advance

 

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