MARK Subcommand (TSPLOT command)
MARK
indicates
the onset of an intervention variable.
- The onset date is indicated by a vertical reference line.
- The specification on
MARK
can be either a variable name or an onset date if the DATE_ variable exists. - If a variable is named, the plot indicates where the values of that variable change.
- A date specification follows the same format as the
DATE
command; that is, a keyword followed by a value. For example, the specification for June 1955 isY 1955 M 6
(orY 55 M 6
if only the last two digits of the year are used onDATE
).
The following figure shows a plot with January 2001 marked as the onset date.
