Thanks Joao, will do that. In the meanwhile, here's hoping I get a few
more responses. :(
Best,
Ramani
On 20/04/2008, Joao Ricardo F. Lima <[email protected]> wrote:
> 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/
>
*
* 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/
