

Reconciling Sample Size Counts 

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Anonymous posted on Thursday, September 01, 2005  11:23 am



I am running a multigroup MIMIC analysis with Type = Missing and am examining the frequency of the data patterns generated by the Patterns output option. For all four of my groups,when I add up the frequencies of the data patterns, I get a number that is larger than the number of observations sample size)listed in the SUMMARY OF ANALYSIS output for the group. Could you please explain why this difference occurs? Here are the details: 709 obs omitted bacause of missing value on grouping variable Group1: sum of pattern freqs = 546 but sample size listed in output = 516 Group2: sum of pattern freqs = 594 but sample size listed in output = 555 Group3: sum of pattern freqs = 789 but sample size listed in output = 744 Group 4: sum of pattern freqs = 628 but sample size listed in output = 560. I note that when I add the printed sample sizes and the 709 omitted observations, I get 3,084 which is the real number of observation in my data file. 516 + 555 + 744 + 560 + 709 = 3,084 (yea!) Thank you very much for your assistance. 


You would need to send the input, output, data, and your license number to support@statmodel.com. This is not enough information to answer your question. 

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