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I am working with a database with missing data. I have done "Roderick J. A. Little’s chi-square statistic" and knew that my data are not MCAR. However, I know don't have can I determine if there are MAR or NMAR. I was wondering if there is a test that you may suggest me. Also, how we can know that how many imputations we have to run and what factors determine the number of imputation we should apply.

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  • $\begingroup$ Can you try to clarify this question? Title seems to be divergent from the contents. (@MTibbits Unfortunately nothing better than asking the OP do it.) $\endgroup$
    – user88
    Jun 29, 2011 at 10:29

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There is no formal test for MAR vs. NMAR, as far as I know. Point estimates are generally believed to be well estimated in most situations with a small number of imputations, but standard errors and confidence intervals require somewhat more. If computing resources are available to do so, using more is better. Here's a good place to look for advice: https://stefvanbuuren.name/fimd/sec-howmany.html.

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