# RE: st: Oaxaca command error

 From "Samer Al-Samarrai" <[email protected]> To <[email protected]> Subject RE: st: Oaxaca command error Date Sat, 18 Nov 2006 19:13:41 +0600

```Dear Owour,
Thanks for the suggestion. I am not really sure why the number of dummy
variables should make a difference to the decomposition. However, I removed
all the dummy variables and just left the continuous variables (age and
years of education) and I still have the same problem.
Any ideas?
Cheers
Samer

-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of george owuor
Sent: 18 November 2006 16:45
To: [email protected]
Subject: Re: st: Oaxaca command error

Semer

your comand is for a simple OLS, but looking at your exogenours variables
you seem to have so many dummy variables in the midst of afew continours. My
bet is that you should  have as many contionours variables as possible and
reduce the dummies to 2 or 1. Many dummies in OLS may lead to colliniearity
or just a collapse of the estimation
Owuor

----- Original Message ----
From: Samer Al-Samarrai <[email protected]>
To: [email protected]
Sent: Saturday, November 18, 2006 6:00:36 AM
Subject: st: Oaxaca command error

Dear Ben and all,

Below is my output and commands for the command I am trying to run. Any
ideas why I am getting the error at the end?

Kind regards

Samer

. regress logwage q04_1a agesq nonmuslim unmarried widdiv edyears urban
othact daily public if
>  q02_1a==1

Source |       SS       df       MS              Number of obs =
6076
-------------+------------------------------           F( 10,  6065) =
291.05
Model |  841.657382    10  84.1657382           Prob > F      =
0.0000
Residual |  1753.89694  6065  .289183337           R-squared     =
0.3243
0.3232
Total |  2595.55432  6075   .42725174           Root MSE      =
.53776

----------------------------------------------------------------------------
--
logwage |      Coef.   Std. Err.      t    P>|t|     [95% Conf.
Interval]
-------------+--------------------------------------------------------------
--
q04_1a |   .0531162   .0033754    15.74   0.000     .0464993
.0597332
agesq |   -.000566   .0000395   -14.34   0.000    -.0006434
-.0004887
nonmuslim |  -.0547489   .0205557    -2.66   0.008    -.0950455
-.0144524
unmarried |  -.0357809   .0264386    -1.35   0.176      -.08761
.0160482
widdiv |  -.2524801   .0891609    -2.83   0.005    -.4272672
-.077693
edyears |   .0499894   .0017928    27.88   0.000     .0464749
.053504
urban |  -.0843149   .0150202    -5.61   0.000    -.1137597
-.0548701
othact |   -.117553   .0231958    -5.07   0.000     -.163025
-.0720809
daily |   .0528909   .0192471     2.75   0.006     .0151598
.090622
public |   .3782054   .0282242    13.40   0.000      .322876
.4335349
_cons |    1.11547   .0719105    15.51   0.000     .9745004
1.25644
----------------------------------------------------------------------------
--

. estimates store male

. regress logwage q04_1a agesq nonmuslim unmarried widdiv edyears urban
othact daily public  i
> f q02_1a==2

Source |       SS       df       MS              Number of obs =
911
-------------+------------------------------           F( 10,   900) =
75.53
Model |  345.167654    10  34.5167654           Prob > F      =
0.0000
Residual |  411.300243   900   .45700027           R-squared     =
0.4563
0.4502
Total |  756.467897   910  .831283403           Root MSE      =
.67602

----------------------------------------------------------------------------
--
logwage |      Coef.   Std. Err.      t    P>|t|     [95% Conf.
Interval]
-------------+--------------------------------------------------------------
--
q04_1a |   .0249686   .0098448     2.54   0.011     .0056472
.0442901
agesq |  -.0003035   .0001219    -2.49   0.013    -.0005429
-.0000642
nonmuslim |   .1068738   .0562578     1.90   0.058     -.003538
.2172855
unmarried |   -.176665   .0818691    -2.16   0.031    -.3373415
-.0159885
widdiv |   .0578513   .0628656     0.92   0.358    -.0655289
.1812315
edyears |   .0744867   .0051692    14.41   0.000     .0643416
.0846317
urban |  -.0671306    .047878    -1.40   0.161    -.1610962
.0268349
othact |  -.0737967   .2417162    -0.31   0.760    -.5481898
.4005964
daily |   .0375057   .0580337     0.65   0.518    -.0763915
.1514028
public |    .735572   .0722005    10.19   0.000      .593871
.8772729
_cons |    1.07086   .1927252     5.56   0.000     .6926163
1.449103
----------------------------------------------------------------------------
--

. estimates store female

.
. oaxaca male female
area found where variable expected
r(198);

end of do-file

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```