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Type=Complex and singleton PSU's |
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Message/Author |
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Drs. Múthen, I am analyzing the Collaborative Psychiatric Epidemiology Surveys public use data set, and their website explicitly states to use the clustering variable (SECLUSTR) as the PSU. Unfortunately, SECLUSTR has a maximum value of 2, and therefore there are far too many singleton PSU's to handle them by simply deleting those observations from an analysis. In Stata 10/SE, one may handle this problem by using the "singleunit" option following the svyset command. According to ICPSR's CPES documentation, the singleunit option should be specified as "singleunit(certainty)". Does Mplus have a similar option for handling singleton PSU's for "type=complex"?. If so, what would it be? If not, how would you advise handling a complex survey dataset in mplus that has a substantial number of singleton PSU's that cannot be deleted? Thank you in advance for you assistance. Sincerely, Peter |
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Mplus does not delete singleton PSU's. |
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Sara Suzuki posted on Thursday, January 17, 2019 - 10:09 am
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How does Mplus treat singleton PSUs? |
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You should see this message in the output which answers the question. WARNING: THE VARIANCE CONTRIBUTION FROM A STRATUM WITH A SINGLE CLUSTER (PSU) IS BASED ON THE DIFFERENCE BETWEEN THE SINGLE CLUSTER VALUE AND THE OVERALL CLUSTER MEAN. In terms of formula (6) in http://www.statmodel2.com/download/webnotes/mplusnote72.pdf nh/(nh-1) is replaced by 1 for that single PSU stratum and vh is replaced by the average of vh across all the strata. |
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