After optionally transforming the series, the accumulated series can be simply or seasonally differenced by using the VAR and CROSSVAR statement DIF= and SDIF= options. For example, suppose is a monthly time series. The following examples of the DIF= and SDIF= options demonstrate how to simply and seasonally difference the time series.

   dif=(1) sdif=(1)
   dif=(1,12)

Additionally, assuming is strictly positive, the VAR and CROSSVAR statement TRANSFORM=, DIF=, and SDIF= options can be combined.