Include levels of zero count in result of table()
I have a vector of integers between 0 and 5. I want to compute a histogram of counts. For example: y <- c(0, 0, 1, 3, 4, 4) table(y) # y # 0 1 3 4 # 2 1 1 2 However, I also want the results to include the fact that there are zero 2's and zero 5's, ie. I want the returned vector to have length 6. Can I use table() for this? Desired result: # y # 0 1 2 3 4 5 # 2 1 0 1 2 0 rcs Convert your variable to a factor , and set the categories you wish to include in the result using levels . Values with a count of zero will then also appear in the result: y <- c(0, 0, 1, 3, 4, 4) table(factor(y, levels =