DIFF Subcommand (TSPLOT command)
DIFF
specifies
the degree of differencing used to convert a nonstationary variable
to a stationary one with a constant mean and variance before plotting.
- You can specify any positive integer on
DIFF
. - If
DIFF
is specified without a value, the default is 1. - The number of values plotted decreases by 1 for each degree of differencing.
Example
TSPLOT VARIABLES = TICKETS
/DIFF=2.
- In this example, TICKETS is differenced twice before plotting.