[R] Can anyone help me reproduce this SAS Mixed output??
Philip Turk
turk at math.montana.edu
Fri Dec 5 18:49:27 CET 2003
I asked this before and I am going to try again in more applied terms. I
am trying to use R to extract variance components for a two-factor random
effects model with both factors crossed. It would also be nice to
generate some confidence intervals as well. For example, a data set
using SAS Proc Mixed is below followed by the four variance component
estimates and the respective confidence intervals. Currently, I have been
unable to reproduce this in NLME but I am sure I have not correctly
specified the "random" option.
Any help and/or ideas would be greatly appreciated!
## SAS PROGRAM WITH DATA FOLLOWS
data hw7;
input mpg driver car obs;
cards;
25.3 1 1 1
25.2 1 1 2
28.9 1 2 1
30 1 2 2
24.8 1 3 1
25.1 1 3 2
28.4 1 4 1
27.9 1 4 2
27.1 1 5 1
26.6 1 5 2
33.6 2 1 1
32.9 2 1 2
36.7 2 2 1
36.5 2 2 2
31.7 2 3 1
31.9 2 3 2
35.6 2 4 1
35 2 4 2
33.7 2 5 1
33.9 2 5 2
27.7 3 1 1
28.5 3 1 2
30.7 3 2 1
30.4 3 2 2
26.9 3 3 1
26.3 3 3 2
29.7 3 4 1
30.2 3 4 2
29.2 3 5 1
28.9 3 5 2
29.2 4 1 1
29.3 4 1 2
32.4 4 2 1
32.4 4 2 2
27.7 4 3 1
28.9 4 3 2
31.8 4 4 1
30.7 4 4 2
30.3 4 5 1
29.9 4 5 2
;
proc mixed data = hw7 method = reml cl asycov;
class driver car;
model mpg =;
random driver car driver*car;
run;
quit;
## SELECTED OUTPUT FOLLOWS
Covariance Parameter Estimates
Cov Parm Estimate Alpha Lower Upper
driver 9.3224 0.05 2.9864 130.79
car 2.9343 0.05 1.0464 24.9038
driver*car 0.01406 0.05 0.001345 3.592E17
Residual 0.1757 0.05 0.1029 0.3665
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