Message-ID: <1050328150.3e9abc566e729@webmail.sapo.pt>
Date: 2003-04-14T13:49:10Z
From: Luis Silva
Subject: categorical variables
Dear helpers
I constructed a data frame with this structure
> str(dados1)
`data.frame': 485 obs. of 16 variables:
$ Emissor : int 1 1 1 1 1 1 1 1 1 1 ...
$ Marisca.Rio : int 1 1 1 1 1 1 1 1 1 1 ...
$ Per?odo : int 1 1 1 1 1 1 1 1 1 1 ...
$ Reproducao : int 3 3 3 3 3 3 3 3 3 3 ...
$ Estacao : int 2 2 2 2 2 2 2 2 2 2 ...
$ X30cm : int 1 1 1 1 1 1 1 1 1 1 ...
$ Dir.mov : int 0 0 0 0 0 0 0 0 0 0 ...
$ Temp.media : num 12.0 11.3 12.1 12.3 12.4 ...
$ Temp.amplitude : num 1.167 -0.750 0.875 0.125 ...
$ Vel.media : num 0.479 0.514 0.517 0.445 0.468 ...
$ Vel.amplitude : num -0.04865 0.03417 0.00312 0.02364 ...
$ Caudal.medio : num 0.570 0.585 0.589 0.485 0.501 ...
$ Caudal.amplitude: num -0.04323 0.01449 0.00405 0.01617 ...
$ Prof.media : num 36.1 34.6 34.1 32.9 32.1 ...
$ Prof.amplitude : num 0.458 -1.500 -0.500 -1.250 -0.750 ...
$ Movimento : num 0 0 0 0 0 0 0 0 0 0 ...
My problem is that the first 7 variables are in fact
categorical, some of them of the type Present/Absent. R is
taking them as integer but I want categorical. How can I solve
this problem? I searched data.frame help but I didn't found any
parameter to set some variables to categorical
thank you
luis
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