failure of nlsList()

Nathan Pace (nlpace@bigpace.med.utah.edu)
Tue, 06 Jan 1998 19:24:53 -0600


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I'd appreciate help from anyone using nlsList().

I called nlsList() using a parametrized data frame with starting values
for the 4 parameters in the model equation. The parametrized data frame
has no missing values. There are 1992 observations on 65 individuals
(clusters). The model equation included the derivatives.

The following error messages resulted:

Error in nls(formula = formula, data = data, contr..: 47 NAs found in
value
Dumped
Error was while calling subroutine "setup_nonlin"
Error in nls(formula = formula, data = data, contr..: 44 NAs found in
value
Dumped

.
.
.

Error in nls(formula = formula, data = data, contr..: 21 NAs found in
value
Dumped
Error was while calling subroutine "setup_nonlin"

NAs were found in all observations for all individuals.

Any thoughts about this problem?

--
Nathan Leon Pace, M.D., Professor of Anesthesiology
University of Utah, Salt Lake City, Utah 84132
W: 801-581-6393                H: 801-467-2925
W: 801-581-4367 (FAX)          H: 801-467-0555 (FAX)
W: nlpace@bigpace.med.utah.edu H: nlpaces@sisna.com

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