On 12/1/2023 11:47 AM, peter dalgaard wrote:
Also, and possibly more constructively, when you get an error like
CI.c = predict(mod2, data.frame( `plant-density` = x), interval = 'c') # fail
Error in eval(predvars, data, env) : object 'plant-density' not found
you should check your assumptions. Does "newdata" actually contain a columnn called
"plant-density":
Great advice/strategy. Thanks!
head(data.frame( `plant-density` = x))
plant.density
1 65.00000
2 65.11912
3 65.23824
4 65.35736
5 65.47648
6 65.59560
I.e., it doesn't. So check help for data.frame and looking for something with
names.
On 1 Dec 2023, at 01:47 , Bert Gunter <bgunter.4...@gmail.com> wrote:
"Thank you Rui. I didn't know about the check.names = FALSE argument.
Another good reminder to always read help, but I'm not sure I understood
what help to read in this case"
?data.frame , of course, which says:
"check.names
logical. If TRUE then the names of the variables in the data frame are
checked to ensure that they are syntactically valid variable names and
are not duplicated. If necessary they are adjusted (by make.names) so
that they are. "
-- Bert
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