Alex Rivera | Logout

count of entries in data frame in R

Asked 2009-11-28T19:38:43.553
30

I'm looking to get a count for the following data frame:

> Santa
   Believe Age Gender Presents Behaviour
1    FALSE   9   male       25   naughty
2     TRUE   5   male       20      nice
3     TRUE   4 female       30      nice
4     TRUE   4   male       34   naughty

of the number of children who believe. What command would I use to get this?

(The actual data frame is much bigger. I've just given you the first four rows...)

Thanks!

r count dataframe
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43

You could use table:

R> x <- read.table(textConnection('
   Believe Age Gender Presents Behaviour
1    FALSE   9   male       25   naughty
2     TRUE   5   male       20      nice
3     TRUE   4 female       30      nice
4     TRUE   4   male       34   naughty'
), header=TRUE)

R> table(x$Believe)

FALSE  TRUE 
    1     3
answered 2009-11-28T19:57:34.033

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