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dati2
2003 Oct 24
1
gee and geepack: different results?
...nts are slightly different in value but
sometimes opposite in sign.
Moreover, the estimate of rho (correlation coefficient) given by gee is
0.5759 (see element 1.2 in the working correlation matrix) while the
estimate given by geese is 0.4519.
Could somebody explain me what happened?
Data are in dati22, which is only a part of the data for the study I
intend to perform. Here what I did ,using first gee and then geese:
> str(dati22)
`data.frame': 47 obs. of 7 variables:
$ TR : Factor w/ 4 levels "7","8","9","11": 1 1 1 1 1 1 1 1 1 1 ...
$ STA...