Running the following single group time series:
Not sure why posttrend is disallowed. I'm following an example here: https://www.google.com/url?sa=t&rct=...10151844,d.cWw .I need the post intervention slope. Can anyone help?
Code:
. tsset qtr2, quarterly
time variable: qtr2, 1991q1 to 2013q4
delta: 1 quarter
. itsa x, single trperiod(200) lag(1) posttrend fig
time variable: qtr2, 1991q1 to 2013q4
delta: 1 quarter
option posttrend not allowed
r(198);
