R help - Jul 2009 - Problem with GroupedData

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



      
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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<kagba2006 at 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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