Question: how to calculate percent difference in r?
Answer: Description. Calculate the k-period percent difference within one series, or between two series. ... 
Usage. Delt(x1, x2 = NULL, k = 0, type = c("arithmetic", "log"))
Arguments. x1. ... 
Details. When called with only x1 , the one period percent change of the series is returned by default. ... 
Value. ... 
Author(s) ... 
See Also. ... 
Examples.