Error in aggregate.data.frame : arguments must have same length

Question

I keep getting this error and I\'m not quite sure what it means. All of my variable names are consistent and there are no typos. Am I missing something here?

The code

Answer 1

Using data.frame as by argument works for me try this:

datNewagg <- aggregate (dataNew, by = dataNew[c('x', 'y', 'z', 'a', 'ab')],                                                             FUN = mean)

I mean don't give the by argument, just the name of the arguments, give a data.frame with columns as these arguments