Question

I know this is a simple question for skilled user of R, but I don’t know how to access the stl output. I googled it for a while but i didn’t found any tutorial. This is what i mean, I have this little sequence of command

   dd<-read.table('data.dat')
   ddts<-ts(dd,start=1,freq=300)
   stldd<-stl(ddts,s.window='periodic')

know i want to perform a fit on the trend part of stldd, but I don’t know how to access it.

Answer 1

You can use str to view the structure of an object. stl objects are quite complicated, but you can extract the trend using:

stldd$time.series[,"trend"]