[R] Create a categorical variable from numeric column

[Bert Gunter]

No.

Use ?cut instead.

-- Bert

On Sun, Oct 6, 2013 at 6:29 AM, arun <smartpink111 at yahoo.com> wrote:
>
>
>
> Hi,
>
> I created 3 categories. If 1-7 and 18-24 should come under the same category, then:
>  Categ<- findInterval(dat1$Col1,c(8,18))+1
> Categ[Categ>2]<- 1
> dat1$Categ<- Categ
>  tail(dat1)
> #   Col1       Col2 Categ
> #45    2 -0.5419758     1
> #46   21  1.1042719     1
> #47   24 -1.0787079     1
> #48   18  0.6253085     1
> #49   15 -1.6822411     2
> #50   16 -0.5966446     2
>
> A.K.
>
>
>
>
>
> ----- Original Message -----
> From: arun <smartpink111 at yahoo.com>
> To: R help <r-help at r-project.org>
> Cc:
> Sent: Saturday, October 5, 2013 8:30 PM
> Subject: Re: Create a categorical variable from numeric column
>
> Hi,
> Try:
> set.seed(29)
> dat1<- data.frame(Col1=sample(1:24,50,replace=TRUE),Col2=rnorm(50))
>  dat1$Categ <- findInterval(dat1$Col1,c(8,18))+1
>   head(dat1)
> #  Col1        Col2 Categ
> #1    3 -0.09381378     1
> #2    6 -0.83640257     1
> #3    3  0.00307641     1
> #4    8  0.04197496     2
> #5   15  0.15433872     2
> #6    3 -0.21301893     1
>
> split(dat1,dat1$Categ)
>
>
> A.K.
>
>
> I  have a data frame that contains a numerical variable ranging from 1 to 24. I would like to create a new category with two ranges: 1 to 7
> and 18 to 24 will form one category and 8 to 17 will form another. How
> can I create this category?
>
> Thanks
>
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> and provide commented, minimal, self-contained, reproducible code.



-- 

Bert Gunter
Genentech Nonclinical Biostatistics

(650) 467-7374