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Use this tag for any *on-topic* question that (a) involves `R` either as a critical part of the question or expected answer, & (b) is not *just* about how to use `R`.
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Mixed model in R and SPSS - different degree of freedom
According to manuals for R/SPSS, both packages seem to use the same method (Satterthwaite) to approximate degree of freedom. … Estimated values for intercept and slope were very similar between R and SPSS, while DF differed largely. For example, for the slope for the lower-level, DFs were 123.9 in SPSS and 2.4 in R. …