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noting
2003 Jul 04
0
degrees of freedom in nlme() (PR#2384)
...algorithm failed to converge (represented
by NA).
> DF
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
2 NA 2 NA 12 12 12 NA 12 12 2 2 12 2 12 12 2 12 2 12
A potential fix for this issue would be to replace line 7282 of
R/library/nlme/R/nlme from this expression:
if (any(notIntX <- apply(X, 2, function(el) any(el != el[1])))) {
to this expression:
if (any(notIntX <- apply(X, 2, function(el) any(abs(el -
el[1])>10*sqrt(.Machine$double.eps))))) {
The constant 10*sqrt(.Machine$double.eps) is rather arbitrary and I am not
sure which value would be best to use. Ho...