# Is there a way to undifference a fractionally differenced time series in R

Say I have data

d <- .4

series <- 100-0:6

fd_data <-  diffseries(series, d)


fd_data:

3.000000  0.800000 -0.160000 -0.832000 -1.372800 -1.837056 -2.250394


[How] Is it possible to get back to the original values?

• This looks useful possibly. stats.stackexchange.com/questions/404475/… Nov 8, 2020 at 17:51
• I saw that. That is standard arima, not arfima from what I can tell. Nov 8, 2020 at 17:52
• Hi: Yeah. Sorry. I just went by the title which I guess is wrong. Nov 8, 2020 at 22:41