Re: Create new category column in dataframe

[David L Lorenz <lorenz@usgs.gov>]

Weiyang,
  Check out cut() on the absolute
values, abs(), of the variable in questions.
Dave

Lim Weiyang <aficionado82@yahoo.com.sg>
Sent by: s-news-owner@lists.biostat.wustl.edu

11/01/2008 01:33 PM

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aficionado82@yahoo.com.sg

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Subject	[S] Create new category column in dataframe

Dear S-Users,
 
I wonder whether I can create a new factor column with new categories and names derived from a column with numeric values. For example, I wish to have four categories of the following form and names(firstcat, secondcat, thirdcat, fourthcat):
 
Between -1 and 1: firstcat
Between -2 and -1 or between 1 and 2: secondcat
Between -5 and -2 or between 2 and 5: thirdcat
Below -5 or more than 5: fourthcat
 
I have looked at functions cut, factor etc but do not know how to use them for my purpose.
 
Sincerely hope to have some assistance.
 
Thank you.
 
Best Regards,
Weiyang
 
 

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