.BG
.FN monthplot
.TL
Seasonal Subseries Plot
.CS
monthplot(y, labels, prediction=1)
.AG y
a time-series, typically the seasonal component of a seasonal
adjustment procedure such as `sabl'.
The series `y' is broken into `frequency(y)' subseries, e.g.,
the January subseries, the February subseries,
.I etc .
The plot shows variation about the midmean (25% trimmed mean)
of each subseries.
.AG labels
optional vector of labels for each subseries.
Default values are:
(1) month names if `frequency(y)' is 12;
(2) quarter number, if `frequency(y)' is 4;
(3) digits from 1 to `frequency(y)', for all other cases.
.AG prediction
number of years at the end of the series which are predictions.
These are drawn as dotted lines (graphical parameter `lty=2').
.GR
.SH REFERENCE
William S. Cleveland and Irma J. Terpenning,
"Graphical Methods for Seasonal Adjustment",
.ul
Journal of the American Statistical Association,
Vol. 77, No. 377, pp. 52-62, 1982.
.EX
fit <- sabl(ship)
monthplot(fit$seasonal,
      main="Seasonal Component of Manufacturing Shipments")
.PI
.KW ts
.KW hplot
.WR
