[R] How to create a column in dependence of another column

[William Dunlap]

It might be simpler to use cut():
   > trans_value <- c(3000, 200, 400, 50, 2000)
   > cut(trans_value, breaks=c(-Inf, 200, 500, Inf), labels=c("low","medium","high"))
   [1] high   low    medium low    high
   Levels: low medium high

Bill Dunlap
Spotfire, TIBCO Software
wdunlap tibco.com


> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf
> Of Rui Barradas
> Sent: Tuesday, October 09, 2012 9:54 AM
> To: fxen3k
> Cc: r-help at r-project.org
> Subject: Re: [R] How to create a column in dependence of another column
> 
> Hello,
> 
> As for creating the new variable try
> 
> 
> dataSet <- within(dataSet,
>      deal_category <- ifelse(trans_value < 200, "low",
> ifelse(trans_value < 500, "medium", "high")))
> 
> 
> And the rest seems ok. Run the code and see if it is.
> 
> Hope this helps,
> 
> Rui Barradas
> Em 09-10-2012 10:25, fxen3k escreveu:
> > Hi there,
> >
> > I'm sorry for the bad subject decision. Couldn't describe it better...
> >
> > In my dataset called "dataSet" I want to create a new variable column called
> > "deal_category" which depends on another column called "trans_value".
> > In column "trans_value" I have values in USDm. Now what I want to do is to
> > give these values a category called "low", "medium" or "high". The
> > classification depends on the size of the values.
> >
> > "low", if value in "trans_value" is < 200 USDm
> > "medium", if value x in "trans_value" is: 200 USDm =< x < 500 USDm
> > "high", if value in "trans_value" is: >= 500 USDm
> >
> > Having defined these deals with low, medium, high I want to run a lm() with
> > these categories as independent variable.
> >
> > deal_category2 <- factor(deal_category)
> > levels(deal_category2) <- c("low", "medium", "high")
> > reg_1 <- lm(dep_var1 ~ indep_1 + indep_2 + deal_category2)
> > summary(reg_1)
> >
> > Is this correct? Does R recognize my categories as variables?
> >
> > Thanks for all your support!
> >
> > Felix
> >
> >
> >
> > --
> > View this message in context: http://r.789695.n4.nabble.com/How-to-create-a-
> column-in-dependence-of-another-column-tp4645548.html
> > Sent from the R help mailing list archive at Nabble.com.
> >
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