SPSS vs. SAS for n = 1 at level 1 for mixed model

Posted by Dale Glaser on Aug 14, 2006; 6:14pm
URL: http://spssx-discussion.165.s1.nabble.com/effect-size-eta-squared-vs-partial-eta-squared-tp1069749p1069753.html

I have a multilevel dataset with quite a few singletons, i.e, level one units with n = 1; I believe that all of the level 2 units will be kept for the fixed effects analysis, but this would not be the case for the estimation of the variance components.  A colleague commented that in regards to SAS MIXED....."SAS probably addresses this issue by excluding "effects" (which are confounded across levels) when estimating sample- and group-level variances".   However, I use SPSS mixed model and HLM6.0 and I wanted to see if anyone on this listserv knew if SPSS and/or HLM handle singletons (n =1 at level 1) statistically in the same way as SAS?....thank you very much for any help......Dale


Dale Glaser, Ph.D.
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