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LCA: understanding settings |
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I am wanting to determine the number of clusters are appropriate for lab data I have on 1210 female samples. I made all the variables binary. I am new to using Mplus and am confused on the settings. The below code, ANALYSIS: Type=mixture; STARTS = 5000 20; STITERATIONS = 40; LRTSTARTS = 0 0 40 10; LRTBOOTSTRAP = 1000; produced this warning: THE BEST LOGLIKELIHOOD VALUE WAS NOT REPLICATED IN 2955 OUT OF 5000 BOOTSTRAP DRAWS. THE P-VALUE MAY NOT BE TRUSTWORTHY DUE TO LOCAL MAXIMA. INCREASE THE NUMBER OF RANDOM STARTS USING THE LRTSTARTS OPTION. So I tried the below code: ANALYSIS: Type=mixture; STARTS = 5000 20; STITERATIONS = 40; LRTSTARTS = 0 0 40 10; LRTBOOTSTRAP = 5000; same warning as above. Then I changed the LRTSTARTS settings: ANALYSIS: Type=mixture; STARTS = 5000 20; STITERATIONS = 40; LRTSTARTS = 0 0 80 20; LRTBOOTSTRAP = 5000; and it ran fine. I do not completely understand how to change the settings of LRTSTARTS and LRTBOOTSTRAP and could not find a clear definition of what each step is doing in the manual, only examples. Thank you for any help that is given. It is greatly appreciated. |
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It is the LRTSTARTS option that is the key here - see page 552 in the UG. |
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