Ramani,
sorry but I can't help you. With me the selmlog works well. Send a
mail to Rafa - [email protected].
Best,
Joao Ricardo Lima
2008/4/20, Ramani Gunatilaka <[email protected]>:
> Dear Joao Lima,
> Thank you for your response. Sample size by select_m depvar category
> is as follows, there are no missing values:
> tabulate selmcat
>
> categorical
> variable
> showing
> employment
> sector
> choice Freq. Percent Cum.
>
> 1 1,884 6.36 6.36
> 2 12,238 41.34 47.70
> 3 3,723 12.58 60.28
> 4 5,043 17.03 77.31
> 5 6,716 22.69 100.00
>
> Total 29,604 100.00
>
> . sum w3
>
> Variable Obs Mean Std. Dev. Min Max
>
> w3 3723 4.013316 1.095727 -6.050407 6.69982
>
> Public sector wage variable W3 has values for all 3723 public employee
> observations and missing values for the observations relating to other
> employment categories.
>
> . sum $basefactors1
>
> Variable Obs Mean Std. Dev. Min Max
>
> male 29604 .6367721 .4809379 0 1
> age 29604 38.82702 13.52627 11 93
> agesqd 29604 1690.491 1133.976 121 8649
> SL_Tamil 29604 .042832 .2024817 0 1
> I_Tamil 29604 .056614 .2311074 0 1
>
> Moor 29604 .0472571 .2121919 0 1
> other 29604 .0040873 .0638022 0 1
> jsecondary 29604 .2399676 .4270706 0 1
> ssecondary 29604 .5070599 .4999586 0 1
> tertiary 29604 .0330699 .178822 0 1
>
> managerial 29604 .0839751 .2773552 0 1
> professional 29604.0482029 .2141984 0 1
> technician 29604 .0463789 .2103078 0 1
> clerical 29604 .0352317 .1843681 0 1
> service 29604 .0671869 .2503496 0 1
>
> agricultural 29604 .2110526 .4080625 0 1
> elementary 29604 .2822929 .4501227 0 1
> manuf 29604 .2341913 .4234995 0 1
> services 29604 .3759627 .4843786 0 1
> rural 29604 .8120524 .3906769 0 1
>
> estates 29604 .0733685 .2607448 0 1
> CP 29604 .1397784 .3467628 0 1
> SP 29604 .1732874 .3785019 0 1
> NWP 29604 .1327523 .3393126 0 1
> NCP 29604 .0744494 .2625053 0 1
>
> Uva 29604 .0816444 .2738268 0 1
> Sab 29604 .118261 .3229224 0 1
>
> I don't have any missing values for $basefactors1 variables - almost
> all are 0/1 dummies.
>
> . sum $selfactors
>
> Variable Obs Mean Std. Dev. Min Max
>
> nempld 29604 2.234901 1.141517 0 9
> nempld_m 29604 5.670382 5.652145 0 54
> children 29604 .6210985 .8557174 0 6
> mother 29604 .140758 .3477776 0 1
> hh_head 29604 .4264626 .494571 0 1
>
> married 29604 .6940616 .4608115 0 1
> malemarried 29604 .4621673 .4985751 0 1
>
> There are no missing values for the demographic variables used for the
> selection equation.
>
> Thank you for your help.
> Best,
> Ramani
>
>
> On 19/04/2008, Joao Ricardo F. Lima <[email protected]> wrote:
> > Ramani,
> >
> > please give us more information. How many observations do you have?
> > Are there missing values to the independent variables? Could you send
> >
> > sum w3 $basefactors1 selmcat $selfactors
> >
> > I used selmlog and with missing values, the program drop that observations.
> >
> > Best,
> >
> > Joao Lima
> >
> > 2008/4/19, Ramani Gunatilaka <[email protected]>:
> > > Dear Statalist,
> > > I am using selmlog to estimate wage functions. The full sample is of
> > > labour market participants.
> > > For the multinomial logit part, I have five categories - 1.
> > > unemployed, 2. contributing family workers, own account workers,
> > > employers, 3. public employees 4. private formal employees 5. informal
> > > employees.
> > > I have wage data only for categories 3, 4 and 5. I want to estimate
> > > wage functions for each of these. As suggested by Rafa de Hoyes in an
> > > old Statapost (12 April 2006), I defined separate wage variables for
> > > each of these wage categories.
> > > w3 is the wage data for public employees. There are 3723 of them.
> > >
> > > Now when I run the following model for the public sector, the eventual
> > > wage equation ends up with only about 400 observations.
> > >
> > > selmlog w3 $basefactors1, select(selmcat=$basefactors1 $selfactors) showmlogit
> > >
> > > Can somebody please tell me why this is so?
> > > BTW, I intend bootstrapping to fix the standard errors but will embark
> > > on that time-consuming exercise once I sort out this problem.
> > > Thank you in advance,
> > > Ramani
> > > *
> > > * For searches and help try:
> > > * http://www.stata.com/support/faqs/res/findit.html
> > > * http://www.stata.com/support/statalist/faq
> > > * http://www.ats.ucla.edu/stat/stata/
> > >
> >
> >
> > --
> > -------------------------------
> > Joao Ricardo Lima
> > Professor
> > UFPB-CCA-DCFS
> > +553138923914
> > -------------------------------
> > *
> > * For searches and help try:
> > * http://www.stata.com/support/faqs/res/findit.html
> > * http://www.stata.com/support/statalist/faq
> > * http://www.ats.ucla.edu/stat/stata/
> >
> *
> * For searches and help try:
> * http://www.stata.com/support/faqs/res/findit.html
> * http://www.stata.com/support/statalist/faq
> * http://www.ats.ucla.edu/stat/stata/
>
--
-------------------------------
Joao Ricardo Lima
Professor
UFPB-CCA-DCFS
+553138923914
-------------------------------
*
* For searches and help try:
* http://www.stata.com/support/faqs/res/findit.html
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
