CSUM Function (CREATE command)
CSUM
produces
new series based on the cumulative sums of the existing series. Cumulative
sums are the inverse of first-order differencing.
- The only specification on
CSUM
is the name or names of the existing series in parentheses. - Cases with missing values in the existing series are not used to compute values for the new series. The values of these cases are system-missing in the new series.
Example
CREATE NEWVAR1 NEWVAR2 = CSUM(TICKETS RNDTRP).
- This example produces a new series called NEWVAR1, which is the cumulative sum of the series TICKETS, and a new series called NEWVAR2, which is the cumulative sum of the series RNDTRP.