Change iterations

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Anna

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Nov 28, 2021, 11:31:30 AM11/28/21
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An SEM I'm running says it ends normally after 423 iterations. Is there a way I can set the number of iterations in R? I'm comparing my results to MPlus, in which I used 15000 iterations. The only thing I could find about setting iterations in R is to set the maximum number of iterations using control=list(iter.max= . I've tried setting the maximum number of iterations to different numbers, but it always ends after 423. Any help would be appreciated!

Anna

Shu Fai Cheung

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Nov 28, 2021, 1:14:52 PM11/28/21
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> I've tried setting the maximum number of iterations to different numbers

As the name of the argument implies, it controls the maximum number of iterations. If convergence was achieved after 423 iterations, then even if you set the maximum number of iterations to any number higher than 423, it will always stop after 423 iterations if the starting values are the same and no stochastic perturbation is involved in the optimization.

> I'm comparing my results to MPlus, in which I used 15000 iterations

I am not familiar with Mplus. Did you mean Mplus achieved convergence after 15000 iterations? Or did you force Mplus to do 15000 iterations? Or did you mean you set the maximum number of iterations to 15000 in Mplus?

-- Shu Fai

Edward Rigdon

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Nov 28, 2021, 1:22:17 PM11/28/21
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Was the Mplus run a Bayesian application, using iterations for burn-in and then for a Monte Carlo estimation?

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Anna

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Dec 4, 2021, 3:32:58 PM12/4/21
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Thanks for your help!

I'm not very familiar with Mplus either. My advisor is the one that ran the analysis with Mplus. It says that the maximum number of iterations was 150000. It did converge, but I'm not sure after how many iterations. 

Pat Malone

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Dec 4, 2021, 5:02:57 PM12/4/21
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Anna,

If you don't see the number of iterations Mplus actually used in the default output, you can specify OUTPUT: TECH8; and see it.

Pat

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Patrick S. Malone, PhD
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