Recoding variables in R
It looks like your data has class "factor". If you call factor() on a factor variable, without supplying an explicit 'levels' argument it produces a new factor variable without any levels not present in the input factor. E.g.,
fOrig <- factor(c(NA,"A","B","D",NA,"D"), levels=c("D","C","B","A"))
summary(fOrig)
D C B A NA's 2 0 1 1 2
fNew <- factor(fOrig) summary(fNew)
D B A NA's
2 1 1 2
You can use levels(fNew) <- c("delta","beta","alpha") to give the levels
new names.
I think that renaming "0", "2", "3" to "0","1","2" will lead to
confusion. The levels
are just names, so give them names that mean something to a human, like
"control",
"streptomycin (2 mg/kg)", etc.
Bill Dunlap
TIBCO Software
wdunlap tibco.com
On Wed, May 23, 2018 at 3:14 AM, Lisa van der Burgh <lisavdburgh at hotmail.com
wrote:
Hi all, I have a very general question and I think for you maybe very easy, but I am not able to solve it. I have a dataset and that dataset contains the variable Anxiolytics. This variable is coded as 0, 1, 2. The variable looks as follows:
summary(DF$Anxiolytics)
0 1 2 NA's 1102 0 20 440 You can see that the variable is coded as 0, 1, 2, but group 1 is 'empty'. So I want to remove this group, such that I get:
summary(DF$Anxiolytics)
0 2 NA's 1102 20 440 And then I want to recode the variable in a way that 2 becomes 1, such as:
summary(DF$Anxiolytics)
0 1 NA's
1102 20 440
Can you help me with the code for doing this?
Thank you in advance!
Best, Lisa
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