PERIOD Subcommand (TSPLOT command)
PERIOD
indicates
the length of the period to be used by the SDIFF
subcommand.
- The specification on
PERIOD
indicates how many observations are in one period or season and can be any positive integer. - If
PERIOD
is not specified, the periodicity established onTSET PERIOD
is in effect. IfTSET PERIOD
is not specified, the periodicity established on theDATE
command is used. If periodicity was not established anywhere, theSDIFF
subcommand will not be executed.
Example
TSPLOT VARIABLES = TICKETS
/SDIFF=1
/PERIOD=12.
- This command applies one degree of seasonal differencing with 12 observations per season to TICKETS before plotting.