Re: [R] how to collapse categories or re-categorize variables?

Thank you very much to all of you for the responses! Phil, the following two examples worked well in re-categorizing. Is there any way I can retain my original data.frame format? Once I re-categorize the data, the format becomes numeric and the original column names are not retained. I

Re: [R] how to collapse categories or re-categorize variables?

On 2010-07-17 23:03, Peter Dalgaard wrote: Ista Zahn wrote: Hi, On Fri, Jul 16, 2010 at 5:18 PM, CC turtysm...@gmail.com wrote: I am sure this is a very basic question: I have 600,000 categorical variables in a data.frame - each of which is classified as 0, 1, or 2 What I would like to do is

Re: [R] how to collapse categories or re-categorize variables?

Ista Zahn wrote: Hi, On Fri, Jul 16, 2010 at 5:18 PM, CC turtysm...@gmail.com wrote: I am sure this is a very basic question: I have 600,000 categorical variables in a data.frame - each of which is classified as 0, 1, or 2 What I would like to do is collapse 1 and 2 and leave 0 by itself,

Re: [R] how to collapse categories or re-categorize variables?

Please look at Peter Dalgaard's response a little more carefully. There's a big difference between the levels= argument (which must be unique) and the labels= argument (which need not be). Here are two ways to do what you want: d = 0:2 factor(d,levels=0:2,labels=c('0','1','1')) [1] 0 1 1

Re: [R] how to collapse categories or re-categorize variables?

On Sat, Jul 17, 2010 at 9:03 PM, Peter Dalgaard pda...@gmail.com wrote: Ista Zahn wrote: Hi, On Fri, Jul 16, 2010 at 5:18 PM, CC turtysm...@gmail.com wrote: I am sure this is a very basic question: I have 600,000 categorical variables in a data.frame - each of which is classified as 0, 1,

[R] how to collapse categories or re-categorize variables?

I am sure this is a very basic question: I have 600,000 categorical variables in a data.frame - each of which is classified as 0, 1, or 2 What I would like to do is collapse 1 and 2 and leave 0 by itself, such that after re-categorizing 0 = 0; 1 = 1 and 2 = 1 --- in the end I only want 0 and 1

Re: [R] how to collapse categories or re-categorize variables?

Do you want to replace specific values of a data set? df - sample(c(0,1,2),600,replace=T) table(df) df[df==2]-1 table(df) - A R learner. -- View this message in context: http://r.789695.n4.nabble.com/how-to-collapse-categories-or-re-categorize-variables-tp2291704p2291727.html Sent from

Re: [R] how to collapse categories or re-categorize variables?

Hi: See ? levels. Here's a toy example: x - factor(sample(0:2, 10, replace = TRUE)) x [1] 1 2 1 0 2 2 2 2 2 1 Levels: 0 1 2 levels(x) - c(0, 1, 1)# Change level 2 to 1 x [1] 1 1 1 0 1 1 1 1 1 1 Levels: 0 1 HTH, Dennis On Fri, Jul 16, 2010 at 10:18 AM, CC turtysm...@gmail.com wrote:

Re: [R] how to collapse categories or re-categorize variables?

Hi, On Fri, Jul 16, 2010 at 5:18 PM, CC turtysm...@gmail.com wrote: I am sure this is a very basic question: I have 600,000 categorical variables in a data.frame - each of which is classified as 0, 1, or 2 What I would like to do is collapse 1 and 2 and leave 0 by itself, such that after