.BG
.VE $Header: /usr3/s/current/s/.help/RCS/start,v 1.2 83/12/30 19:35:01 rab Exp $
.FN start
.FN end
.FN nper
.TL
end nper start: Time-Series Parameters
.CS
start(x)
end(x)
nper(x)
.PP
.AG x
time-series.  Missing values (NAs) are allowed.
.RT
vector giving the appropriate time parameter of `x'.  In the
case of `start' and `end', the result has 2 values, the year
and month.
.PP
The values of these functions are appropriate for any time-series
function taking arguments start, end, nper.
.PP
.EX
   # assume ts is monthly from Jan. 1970 to Jul. 1975
start(ts)    #is the vector c(1970,1)
end(ts)     # is the vector c(1975,7)
nper(ts)  #is 12
xyz<-ts(data,start=start(gnp),nper=nper(gnp))
      # create time-series beginning at same time as gnp
.KW ts*
.WR
