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Re: st: Regression Equation in ZINB regression
From
Muhammad Anees <[email protected]>
To
[email protected]
Subject
Re: st: Regression Equation in ZINB regression
Date
Mon, 19 Sep 2011 11:20:13 +0500
First check if you have installed -zinb-properly. You can also install
by -ssc install zinb- if you do not have the -zinb- installed.
Now you can use the command as zinb countvariable
independentvariables, inflate(ifcountiszerovariable) and the option
could be understood from help files as" inflate(varlist[,
offset(varname)]|_cons) specifies the equation that determines whether
the observed count is zero. Conceptually, omitting inflate() would be
equivalent to fitting the model with nbreg".
I hope this gives what I have results. My example is as following
which is what you are looking for,
zinb ncigs age agesq male maritalstat4 maritalstat5 maritalstat6,
inflate(avariable)
Zero-inflated negative binomial regression Number of obs = 4219
Nonzero obs = 4206
Zero obs = 13
Inflation model = logit LR chi2(6) = 418.97
Log likelihood = -14584.76 Prob > chi2 = 0.0000
------------------------------------------------------------------------------
| Coef. Std. Err. z P>|z| [95% Conf. Interval]
-------------+----------------------------------------------------------------
ncigs |
age | .0504214 .0046583 10.82 0.000 .0412914 .0595515
agesq | -.0499255 .0055059 -9.07 0.000 -.0607168 -.0391341
male | .1286974 .016588 7.76 0.000 .0961855 .1612092
maritalstat4 | .0028357 .0225372 0.13 0.900 -.0413363 .0470078
maritalstat5 | .1708232 .0425668 4.01 0.000 .0873938 .2542526
maritalstat6 | .0595684 .030313 1.97 0.049 .000156 .1189808
_cons | 1.53228 .0867213 17.67 0.000 1.362309 1.70225
-------------+----------------------------------------------------------------
inflate |
anxiety2 | .3245785 1.27854 0.25 0.800 -2.181314 2.830471
_cons | -6.473971 .5815617 -11.13 0.000 -7.613811 -5.334131
-------------+----------------------------------------------------------------
/lnalpha | -1.520717 .029843 -50.96 0.000 -1.579209 -1.462226
-------------+----------------------------------------------------------------
alpha | .2185551 .0065223 .2061382 .2317199
------------------------------------------------------------------------------
On Mon, Sep 19, 2011 at 12:04 AM, rachel grant
<[email protected]> wrote:
> I have searched the help files but I cannot understand how to get
> Stata to display the regression equation.
> If anyone is able to help, without referring me to manual, it would be
> really appreciated.
>
> --
> regards, Rachel Grant
> *
> * For searches and help try:
> * http://www.stata.com/help.cgi?search
> * http://www.stata.com/support/statalist/faq
> * http://www.ats.ucla.edu/stat/stata/
>
--
Regards
Anees
*
* For searches and help try:
* http://www.stata.com/help.cgi?search
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/