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 on TSET PERIOD is in effect. If TSET PERIOD is not specified, the periodicity established on the DATE command is used. If periodicity was not established anywhere, the SDIFF 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.