Hi Fir,
Are you sure data2 is a data frame? The error message suggests it
isn't. Try class(data2) or str(data2) if you're not sure.
On another note -- perhaps it's better to avoid using groupedData.
I've used the nlme library for years without ever using the grouped
structure. My opinion is that code is much clearer if modeling and
plotting calls do not implicitly rely on a non-standard data
structure.
hth,
Kingsford Jones
On Tue, Jul 14, 2009 at 8:54 AM, FMH<kagba2...@yahoo.com> wrote:
> Hi,
>
> I have an original data frame with 8 columns of variables, which are stored
> in 'data1' frame.
>
> data1 <- read.csv("E:\\PHD GLASGOW
> UNIVERSITY\\Data\\R\\Colin\\Cailness21.csv")
> attach(data1)
> names(data1)
>
> [1] "Date" "d" "m" "y" "Time"
> [6] "Depth" "Temp" "Group_Time"
>
>
> Recently, i try two add a column into this data frame, but when i try to use
> the 'groupedData' function with this new data frame via command below, it
> reported the problem stated after the command below.
>
> library(nlme)
> tmp <- groupedData(Temp ~ d | Depth, data2, order.groups = TRUE, labels =
> list(x = "Month", y = "Temperature"), units = list(y = "0C"))
>
> Error in nfGroupedData(formula = Temp ~ d | Depth, data = data2, order.groups
> = TRUE, :
> second argument to groupedData must inherit from data.frame
>
>
> Could someone help me to sort out on this problem, please?
>
> Thank you
> Fir
>
>
>
>
> [[alternative HTML version deleted]]
>
>
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