PERIOD Subcommand (PPLOT 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. You can specify any positive integer on PERIOD.
  • The PERIOD subcommand is ignored if it is used without the SDIFF subcommand.
  • If PERIOD is not specified, the periodicity that is established on TSET PERIOD is in effect. If TSET PERIOD is not specified either, the periodicity that is established on the DATE command is used. If periodicity was not established anywhere, the SDIFF subcommand will not be executed.

Example

PPLOT VARIABLES = TICKETS
  /SDIFF=1
  /PERIOD=12.
  • This command applies 1 degree of seasonal differencing with 12 observations per season to the variable TICKETS.