Frequency count of two column in R
r
Solution
If your data is dataframe `df` with columns `y` and `m`
library(plyr)
counts <- ddply(df, .(df$y, df$m), nrow)
names(counts) <- c("y", "m", "Freq")
Problem
I have two columns in data frame ``` 2010 1 2010 1 2010 2 2010 2 2010 3 2011 1 2011 2 ``` I want to count frequency of both columns and get the result in this format ``` y m Freq 2010 1 2 2010 2 2 2010 3 1 2011 1 1 2011 2 1 ```