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 Hee-Jin Jun posted on Tuesday, October 23, 2007 - 11:05 am
Dear Linda,

I am working on trajectory analysis.
Outcome variable is binary and we have 18 time point (age 0 to 17). Last three time points (age 15,16,17) we have some systematic missings (some kids haven't reached that age yet).
First I did it with the fixed time points (0 to 17), but it doesn't seem to fit well. So I tried to add quadratic term.
Unfortunately, it took quite a long time (few days) and then crashed (When I check the program, program was ended without output file.)
Next, I freed the time points except the first two. One day later, I also had the same results (program ended with no output file).

I am wondeing if this is a known bug or new one for you and how can I get the results. Because there is no output file, I don't even get any error message.

Thank you for your help.
 Linda K. Muthen posted on Tuesday, October 23, 2007 - 11:18 am
Please send your input, data, output, and license number to support@statmodel.com.
 Hee-Jin Jun posted on Tuesday, October 23, 2007 - 12:20 pm
I have some clarification questions before I send the input file etc.

Is this the right way to add quadratic term?

i s q| wab0@0 wab1@1 wab2@2 wab3@3 wab4@4 wab5@5 wab6@6 wab7@7
wab8@8 wab9@9 wab10@10 wab11@11 wab12@12 wab13@13 wab14@14
wab15@15 wab16@16 wab17@17;

Is below the right way to freeing the time points?

i s| wab0@0 wab1@1 wab2 wab3 wab4 wab5 wab6 wab7 wab8 wab9
wab10 wab11 wab12 wab13 wab14 wab15 wab16 wab17;

If any answer is no, I'd rather do it again and send the results.

Thanks.

Hee-Jin
 Linda K. Muthen posted on Tuesday, October 23, 2007 - 12:53 pm
The answer is yes to both questions.
 Hee-Jin Jun posted on Tuesday, October 30, 2007 - 9:26 am
Dear Linda,

Running Mplus with a large datset with many time points has been challenging.
While I am running a program with 12 time points (N=around 6300), I found that the running time has increased dramatically. E.g. one iteration took about 7500 seconds, which is about 2 hours, for a day since yesterday. I am wondering this is some kind of sign that the program has some difficulties, so that it's better to close and try it again.
Thank you for your help.

e.g.
86 -0.60855213D+05 0.0010999 0.0000000 EM 7472.53 79127.1
87 -0.60855211D+05 0.0014535 0.0000000 EM 7457.41 184.5


Hee-Jin
 Linda K. Muthen posted on Tuesday, October 30, 2007 - 1:01 pm
Please send your input, data, and license number to support@statmodel.com so I can see the particulars of your analysis.
 Sylvana Robbers posted on Wednesday, April 23, 2008 - 4:57 am
Dear Dr. Muthen,

I am running a growth curve model with clustered data and the grouping option:

i s q| extm3@0 extm4@1 extm6@3 extm7@4 extm8@5 extm9@6 extm10@7 extm11@8 extm12@9;
q@0;

When I enter a dichotomous covariate (sex) like this:

i s q ON sex;

then I get no output. Not even an error message. After 5 seconds of 'running' I get my syntax-screen back.
Without the covariate things run just fine.

Do you have any idea why this happens and how I can solve it?

Thanks in advance.
 Linda K. Muthen posted on Wednesday, April 23, 2008 - 5:56 am
Please send your input, data, and license number to support@sttmodel.com.
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