Splitting Data into Groups Using R

Question

      anim    wt
1     181.0   0
2     179.0   1
3     180.5   0
4     201.0   1
5     201.5   1

If I wanted to split this data set into two group. Once group whose wt value 1 and another whose wt value is 0 how do I do that using R. I know you have to use the split function. But don't know which parameters to specify.

You already know which function you have to use. The easiest way then is to check the help page of that function by using either `?split` or `help("split")` to find out more about the parameters you have to use and also some examples. Plus, you could search SO for `[r] split data` to find http://stackoverflow.com/questions/9713294/split-data-frame-based-on-levels-of-a-factor-into-new-data-frames/9713456#9713456 or other previous question. — talat, Dec 08 '14 at 07:26
I know that I managed to figure it out using the split function. However before playing around with the split function a bit more it was not splitting the data at all. The description of the fourth parameter was confusing. — user52760, Dec 08 '14 at 07:28

akrun · Answer 1 · 2014-12-08T07:25:11.687

You can use split. Please check the ?split for argument details

 split(df, df$wt)

If you want it as two dataframe objects df0 and df1

list2env(setNames(split(df, df$wt), paste0('df', 0:1)), envir=.GlobalEnv)

df0
#   anim wt
#1 181.0  0
#3 180.5  0

data

 df <- structure(list(anim = c(181, 179, 180.5, 201, 201.5), wt = c(0L, 
 1L, 0L, 1L, 1L)), .Names = c("anim", "wt"), class = "data.frame",
  row.names = c("1", "2", "3", "4", "5"))

score 0 · Accepted Answer · answered Dec 08 '14 at 07:20

0

You could use the subset function:

dat <- read.csv('ex.dat',sep='')
zeroes <- subset(dat,wt==0)
ones <- subset(dat,wt==1)

answered Dec 08 '14 at 07:20

kilojoules

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Splitting Data into Groups Using R

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