Dear Nicola,
I seem to remember having seen a similar error message. It happened when I
imported data from an Excel worksheet in which rows or records had been
deleted. Try returning to the worksheet, copy the data to a new Excel file,
and import the data to S-Plus from the new file.
Good luck!
Jørgen
--
Jørgen Meisfjord
Dpt. Biology
University of Bergen
PB. 7800
5020 Bergen
Norway
Sitat Nicola Koper <nkoper@yahoo.com>:
> Hi everyone,
>
> I'm just starting to use nlme, and am practicing
> starting with nls (as illustrated on page 347 of
> pinheiro and bates).
>
> For learning purposes, I am starting with a simple
> model,
>
> Model.edge <- nls(richness.song.by.round ~
> INT/(1+(0.25*((disttowkm/ICP)^B))),
> data=upland.point.counts.bt.with.wetlands5, start =
> c(INT = 2, ICP = 1, B = 1))
>
> I am getting the error "546 NAs found in value, while
> calling subroutine do_nls"
>
> This is suspicious, as there are 547 rows of data, but
> I can't figure out the specific problem as neither the
> response variable nor the independent variable
> (disttowkm) have missing values.
>
> Any help would be appreciated.
> Nicky
>
>
>
> ************************************************************
>
> Dr. Nicola Koper
> Assistant Professor
> Natural Resources Institute
> University of Manitoba
>
> __________________________________________________
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