

Minimum level1 sample size? 

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Jane W. posted on Wednesday, March 12, 2014  3:15 pm



I have data on 200+ employees who provided twicedaily ratings over a 7day period. Which I see as:  Level 3 (employee): n=200+  Level 2 (day): n=7  Level 1 (event/withinday): n=2 The variance is mostly distributed across levels 1 and 3, with anywhere from 08% of variance occurring at level 2. Alternatively, I could run a 2level model and collapse across day, such that:  Level 2 (employee): n=200+  Level 1 (event): n=14 Which would help if level1 fixed effects were of primary interest. My questions: 1) In general, is n=2 too small for level 1? 2) Would you run as a 2 or 3level model? Thanks for any input! 


You have too few level 2 units for threelevel analysis. You should use alternative 2. You need at least 20 and some would say 3050 clusters. N=2 is not too small for level 1. 

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