?as.factor states:
To "revert" a factor 'f' to its original
numeric values, 'as.numeric(levels(f))[f]' is recommended and
slightly more efficient than 'as.numeric(as.character(f))
christoph
Petr Pikal wrote:
Hi
On 6 May 2005 at 8:51, Paulo Justiniano Ribeiro Jr wrote:
as.numeric()
Not exactly correct.
as.numeric(as.character())
gives you what you probably want ,if "mass" is really factor ;)
see
str(mass)
Cheers Petr
On Fri, 6 May 2005, Smit, R. (Robin) (IenT) wrote:
I am attempting to develop a multiple regression model using selected model variables that should all be treated as numeric (mostly real) values. However, R considers one specific variable "mass" automatically to be of class "factor", probably because "mass" consists of integer values that are repeated. I now want to force R to treat "mass" as a numeric variable in the regression but am not sure how to do this.
class(mass) <- "numeric"does not help me.
Could anyone advise me on this?
Kind regards, Robin Smit
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