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nono
2003 Mar 31
1
nonpos. def. var-cov matrix
R 1.6.2 for Windows, Win2k:
I have fitted a weighted least squares model using the code
"wls.out <- gls(y ~ x1 + x2 + x3 + x4 + x5 + x6 - 1, data = foo.frame,
weights = varConstPower(form = ~ fitted(.), fixed = list(power = 0.5),
const = 1))"
The data has 62 rows and the response is zero when the covariates are
zero. The purpose of the model was to account
for the the fact that