Calculate Returns over Period of Time

Question

I\'m trying to get a time series of returns for holding a certain asset for a specific time.

My dataframe looks like this:

Date          Price
1998-01-01         


        

Answer 1

Alternatively, if you are using the package xts, then life is made incredibly simple. This is a straight copy-paste of a function I wrote myself a while ago:

ret<-function(x,k=1){
  return(diff(log(x),k))
}