Mover Stayer Single Variable Model PreviousNext
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 Chris Weber posted on Thursday, December 05, 2013 - 9:44 am
I am estimating a simple mover stayer model with a three category variable measured at five time points. Since the latent classes for each of the five waves is measured with a single variable, I constrain the item thresholds. Yet, I get the following error for each class:
*** ERROR in MODEL command
One or more pairs of ordered thresholds are not increasing in Class 1.
Check your starting values. Problem with the following pairs:
PID_1$1 (15.000) and PID_1$2 (-15.000)
PID_2$1 (15.000) and PID_2$2 (-15.000)
.....
Any tips on how to do this?

Clases are specified as follows:
classes= c(2) c1(3) c2(3) c3(3) c4(3) c5(3); !c is mover stayer

At the end of the file, I constrain the thresholds for each of the three classes within the five latent variables (t1-t5). This generates the error. For instance:

model c1:
%c1#1%
[pid_1$1@15];
[pid_1$2@-15];

%c1#2%
[pid_1$1@-15];
[pid_1$2@15];

%c1#3% !baseline
[pid_1$1@-15];
[pid_1$2@-15];

model c2:
%c2#1%
[pid_2$1@15];
[pid_2$2@-15];

....and so forth.
Thanks.
 Bengt O. Muthen posted on Thursday, December 05, 2013 - 10:05 am
You have to order the threshold values from low to high. So

[pid_1$1@15];
[pid_1$2@20];

corresponds to falling in the lowest of the 3 categories,

[pid_1$1@-15];
[pid_1$2@15];

corresponds to falling in the middle category, and

[pid_1$1@-20];
[pid_1$2@-15];

corresponds to falling in the highest of the 3 categories. Note that the threshold values are always increasing.
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