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From |
"Yu(Sophia) Zhang" <[email protected]> |

To |
[email protected] |

Subject |
Re: st: Questions about selmlog and svyselmlog |

Date |
Thu, 21 Oct 2010 14:35:29 -0400 |

Dear Joao, Thanks for your patient explanation. I thought I understood what you mean. But when I followed the rule and made sure that the dependent variable has non-missing values for only one category, the same error still showed up. What I understand the correct data structure about missing values of depvar is like this: depvar varlist, select ( depvar_m = varlist_m).... 500 x 1 z 456 x 1 z 529 x 1 z 601 x 1 z miss x 2 z 547 x 2 z 408 x 2 z 620 x 3 z 599 x 3 z 512 x 3 z miss x 3 z miss x 3 z So the depvar has non-missing values for category 1 only. It has missing values for all the other categories (2 and 3). Would you please kindly correct me if I am wrong? I appologize to ask another question. If the command works, how could save the variable lambda (Heckman correction term)? I appreciate your help a lot! Yu On Wed, Oct 20, 2010 at 11:08 AM, Joao Ricardo F. Lima <[email protected]> wrote: > Dear Yu, > > the sintax of selmlog is: > > selmlog depvar varlist, select(depvar_m=varlist_m) [lee dmf(#) dhl(# [all]) etc > > depvar_m is your categorical variable, with more than 2 categories, oks? > > and > > depvar must have non-missing values for only one of theses categories. > > HTH, > > JL > > > > 2010/10/20 Yu(Sophia) Zhang <[email protected]>: >> Dear Joao, >> >> Thanks so much for your reply. The second question has been solved >> following your suggestion. >> >> For the first one, do you mean that across all categories ( which >> are schools in my selection equation), only one category can have >> non-missing values of dep var, and the other categories must have some >> missing values of depvar? I deleted some values of depvar to meet this >> requirement, but I still got the same error. Would you mind explaining >> it in more detail? >> >> Thank you so much! >> >> Yu >> >> On Tue, Oct 19, 2010 at 7:03 PM, Joao Ricardo F. Lima >> <[email protected]> wrote: >>> Yu, >>> >>> About the first question: >>> >>> The vardep of the income equation must have non missing values ONLY >>> for one category. >>> >>> About the second: >>> >>> the svyselmlog was written to Stata 8. Then, try this: >>> >>> version 8: svyset [pweight = varw], psu(varpsu) strata(varstrat) >>> svyselmlog vardep varindep , sel() meth() boot().... >>> >>> Hope this Helps, >>> >>> Joao Lima >>> >>> >>> 2010/10/19 Yu(Sophia) Zhang <[email protected]>: >>>> Dear statisticians, >>>> >>>> I am now working on my dissertation and am stuck by a STATA command. >>>> Basically, I want to run Heckman correction based on the multinomial logit >>>> model. I am going to use the command selmlog. However, a strange error shows >>>> up like this: >>>> >>>> Non-missing values of dependent variable for more than one outcome >>>> variable _m* not found >>>> >>>> I guess it might be associated with this statement in the help file: >>>> >>>> 1) In the output, selmlog adds to varlist a series of variables labelled >>>> _m[depvar_m value], except for the dhl option >>>> >>>> 2) The outcome variable depvar is observed for only one value of depvar_m. >>>> It is important that depvar should have missing values for any other value >>>> of depvar_m. >>>> >>>> But still cannot figure out what's wrong. >>>> >>>> In addition, when I want to control for sampling weights by running the >>>> command svyselmlog, I get another error: >>>> >>>> data not set up for the old survey estimation commands; use svyset under >>>> version control or use the new svy prefix. >>>> >>>> But there is no "svy: selmlog" command in STATA 11..... >>>> >>>> I wonder if someone could kindly give me some hint for these two >>>> problems. I have asked several people but no one were familiar with this >>>> problem. >>>> >>>> I appreciate your help very much. >>>> >>>> Sincerely, >>>> >>>> Yu >>>> >>>> * >>>> * 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/ >>>> >>> >>> >>> >>> -- >>> --------------------------------------------------------- >>> João Ricardo F. de Lima >>> Pesquisador A - Economia Aplicada >>> Embrapa Semiárido >>> e-mail: [email protected] >>> fone: +55 (87) 3862-1711 Ramal: 167 >>> home-page: www.cpatsa.embrapa.br >>> ---------------------------------------------------------- >>> >>> * >>> * 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/ >>> >> >> >> >> -- >> Yu Zhang >> PhD Candidate >> Economics and Education >> Teachers College, Columbia University >> >> * >> * 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/ >> > > > > -- > --------------------------------------------------------- > João Ricardo F. de Lima > Pesquisador A - Economia Aplicada > Embrapa Semiárido > e-mail: [email protected] > fone: +55 (87) 3862-1711 Ramal: 167 > home-page: www.cpatsa.embrapa.br > ---------------------------------------------------------- > > * > * 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/ * * 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/

**Follow-Ups**:**Re: st: Questions about selmlog and svyselmlog***From:*"Joao Ricardo F. Lima" <[email protected]>

**References**:**st: Questions about selmlog and svyselmlog***From:*"Yu(Sophia) Zhang" <[email protected]>

**Re: st: Questions about selmlog and svyselmlog***From:*"Joao Ricardo F. Lima" <[email protected]>

**Re: st: Questions about selmlog and svyselmlog***From:*"Yu(Sophia) Zhang" <[email protected]>

**Re: st: Questions about selmlog and svyselmlog***From:*"Joao Ricardo F. Lima" <[email protected]>

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