I looked at Plot two graphs in same plot in R but did not figure it out.
trend.ts = ts(c(100,101,102))
plot(trend.ts)
season.ts = ts(c(3,4,5))
lines(season.ts)
Apparently lines
does not draw the season.ts because it is outside of the left y axis.
How to draw it on the same graph on its own right y axis?
Is there some introductory documentation that shows this?