On Oct 2, 2009, at 7:51 AM, Austin Nichols wrote:
Start with
loc v "war income male PID education L.war_casualties L.dem_iraq_email
L.GOP_iraq_email L.dem_iraq_web L.GOP_iraq_web L.media_iraq"
su `v' if tin(2007m9, 2008m3)
xtsum `v' if tin(2007m9, 2008m3)
reg `v' if tin(2007m9, 2008m3)
logit `v' if tin(2007m9, 2008m3)
to help diagnose the problem with your data.
On Thu, Oct 1, 2009 at 10:57 PM, Mark Ludwig <[email protected]>
wrote:
sort id date
. tsset id date, monthly
panel variable: id (weakly balanced)
time variable: date, 2007m7 to 2008m11
delta: 1 month
.
. xtlogit war income male PID education L.war_casualties
L.dem_iraq_email
L.GOP_iraq_email L.dem
_iraq_web L.GOP_iraq_web L.media_iraq if tin(2007m9, 2008m3)
number of quadrature points must be less than or equal to number of
obs
r(198);
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Here's what I get when I try Austin Nichols' suggestion. The crux of
the problem seems to be that when I try to create lags, it generates
missing observations.
sort id date
.. tsset id date, monthly
panel variable: id (weakly balanced)
time variable: date, 2007m7 to 2008m11
delta: 1 month
..
.. loc v "war income male PID education L.war_casualties
L.dem_iraq_email L.GOP_iraq_email L.dem_
> iraq_web L.GOP_iraq_web L.media_iraq"
.. su `v' if tin(2007m9, 2008m3)
Variable | Obs Mean Std. Dev. Min Max
-------------+--------------------------------------------------------
war | 7103 .267915 .4429042 0 1
income | 6447 5.578253 2.273915 1 11
male | 7103 .4971139 .5000269 0 1
PID | 6876 .0900233 .9608538 -1 1
education | 7061 6.664637 1.437452 1 8
-------------+--------------------------------------------------------
war_casual~s |
L1. | 0
dem_iraq_e~l |
L1. | 0
GOP_iraq_e~l |
L1. | 0
dem_iraq_web |
L1. | 0
GOP_iraq_web |
L1. | 0
-------------+--------------------------------------------------------
media_iraq |
L1. | 0
.. xtsum `v' if tin(2007m9, 2008m3)
Variable | Mean Std. Dev. Min Max |
Observations
-----------------+--------------------------------------------
+----------------
war overall | .267915 .4429042 0 1 | N
= 7103
between | .4429042 0 1 | n
= 7103
within | 0 .267915 .267915 | T
= 1
| |
income overall | 5.578253 2.273915 1 11 | N
= 6447
between | 2.273915 1 11 | n
= 6447
within | 0 5.578253 5.578253 | T
= 1
| |
male overall | .4971139 .5000269 0 1 | N
= 7103
between | .5000269 0 1 | n
= 7103
within | 0 .4971139 .4971139 | T
= 1
| |
PID overall | .0900233 .9608538 -1 1 | N
= 6876
between | .9608538 -1 1 | n
= 6876
within | 0 .0900233 .0900233 | T
= 1
| |
educat~n overall | 6.664637 1.437452 1 8 | N
= 7061
between | 1.437452 1 8 | n
= 7061
within | 0 6.664637 6.664637 | T
= 1
| |
L.war_~s overall | . . . . | N
= 0
between | . . . | n
= 0
within | . . . | T
= .
| |
L.dem_.. overall | . . . . | N
= 0
between | . . . | n
= 0
within | . . . | T
= .
| |
L.GOP_.. overall | . . . . | N
= 0
between | . . . | n
= 0
within | . . . | T
= .
| |
L.dem_.. overall | . . . . | N
= 0
between | . . . | n
= 0
within | . . . | T
= .
| |
L.GOP_.. overall | . . . . | N
= 0
between | . . . | n
= 0
within | . . . | T
= .
| |
L.medi~q overall | . . . . | N
= 0
between | . . . | n
= 0
within | . . . | T
= .
.. reg `v' if tin(2007m9, 2008m3)
no observations
r(2000);
Regards,
Mark
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