help with Interpreting the results ITS with single interruption

[Yeganeh Morakabati]

Hi everyone,
I am just wondering if you could give me a hand to make sure what I have done is correct please.
I have run an ITS with single interruption at point 614 (please see below).

1)Could I say the finding suggests that the level of arrivals was at 6333986 (cons) and increasing by 777 (but not significant)?
2)adding in first month of interruption arrivals dropped significantly by -372564 (x614)?
3)but then with significant increase in monthly (_x_t614) trend?
4) finally lincom estimate produced by specifying trend posttrend, that after the interruption, arrival started to pick up?


I hope you can help me :-)
Best wishes
Yeg



format t %tm

. di ym(2011,3)
614

. tsset t
time variable: t, 2006m1 to 2015m12
delta: 1 month

. itsa Arrivals, trperiod(614)lag(1)posttrend figure
time variable: t, 2006m1 to 2015m12
delta: 1 month

Regression with Newey-West standard errors Number of obs = 120
maximum lag: 1 F( 3, 116) = 94.69
Prob > F = 0.0000

------------------------------------------------------------------------------
| Newey-West
Arrivals | Coef. Std. Err. t P>|t| [95% Conf. Interval]
-------------+----------------------------------------------------------------
_t | 777.8001 621.509 1.25 0.213 -453.1767 2008.777
_x614 | -372564.4 45549.34 -8.18 0.000 -462780.6 -282348.2
_x_t614 | 22630.29 1599.061 14.15 0.000 19463.15 25797.44
_cons | 633986.5 20249.85 31.31 0.000 593879.1 674093.9
------------------------------------------------------------------------------


Postintervention Linear Trend: 614

Treated: _b[_t]+_b[_x_t614]
------------------------------------------------------------------------------
Linear Trend | Coeff Std. Err. t P>|t| [95% Conf. Interval]
-------------+----------------------------------------------------------------
Treated | 2.34e+041473.4503 15.8866 0.0000 2.05e+04 2.63e+04
------------------------------------------------------------------------------

[Jesse Wursten]

Hey! I think you'll have more luck getting answers in the main forum (http://www.statalist.org/forums/foru...ussion/general). This is the Mata subforum, for questions related the Stata's Mata language.

[Yeganeh Morakabati]

Thank you so much for letting me know :-)