Displaying 1 result from an estimated 1 matches for "mytan".
Did you mean:
mytag
2010 Feb 16
1
OT: computing percentage changes with negative and zero values?
...et to astronomical levels.
> x[, "exp"] <- c(NA, diff(exp(x$var)) / exp(x[1:19,"var"]))
- atan transformation: this is an in-house bred solution, which
insures that values from -Inf to +Inf are stacked between 0 and pi.
Again, not sure what bias this might introduce.
> mytan <- function(x) .5*pi + atan(x)
> x[, "mytan"] <- c(NA, diff(mytan(x$var)) / mytan(x[1:19,"var"]))
The resulting data frame:
> round(x, 3)
var raw raw abs raw +cst log sqrt box cox exp mytan
1 0.43 NA NA NA NA NA NA...