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From |
"Karadogan, Figen" <fo145502@ohio.edu> |

To |
"statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu> |

Subject |
RE: st: Analyzing a subpopulation in Stata 10.1 |

Date |
Fri, 26 Jun 2009 18:03:00 +0000 |

I am truly sorry for the attachment. Please find my question re-stated below without having any attachment. I would like to find out the proportion of diabetics older than 25yrs old, who go to dentist by education. The N of cases jointly non-missing on diabetes (dmrc_dum), dentist (dentistrc), age older than 25 (agerc25), education (edurc) is 3772. The N of cases jointly non-missing on diabetes and dentist is 3783. I know that Stata needs information from every observation in the sample to compute the variance, standard error and confidence intervals even though only the information in the subsamples is needed to compute proportions. But, I am confused which one of those syntaxes gives me the correct total number of observations = 3772 or 3783?? Output results: svy, subpop(dmrc_dum if agerc25==1): proportion dentistrc if !missing(dmrc_dum, dentistrc, agerc25, edurc), over(edurc)(running proportion on estimation sample) (running proportion on estimation sample) Survey: Proportion estimation Number of strata = 1 Number of obs = 3772 Number of PSUs = 3772 Population size = 365510 N. of poststrata = 108 Subpop. no. obs = 508 Subpop. size = 43946.8 Design df = 3771 _prop_1: dentistrc = No Dentist _prop_2: dentistrc = Yes Dentist _subpop_1: edurc = Less than HS _subpop_2: edurc = HS graduate _subpop_3: edurc = At least some college Over Proportion Std. Err. [95% Conf. Interval] _prop_1 _subpop_1 .6325268 .0584768 .5178775 .747176 _subpop_2 .4420064 .0312256 .3807856 .5032272 _subpop_3 .322104 .0343318 .2547933 .3894146 _prop_2 _subpop_1 .3674732 .0584768 .252824 .4821225 _subpop_2 .5579936 .0312256 .4967728 .6192144 svy, subpop(dmrc_dum if agerc25==1): proportion dentistrc if !missing(dmrc_dum, dentistrc, agerc25), over(edurc) (running proportion on estimation sample) Survey: Proportion estimation Number of strata = 1 Number of obs = 3783 Number of PSUs = 3783 Population size = 365510 N. of poststrata = 108 Subpop. no. obs = 508 Subpop. size = 43724.1 Design df = 3782 _prop_1: dentistrc = No Dentist _prop_2: dentistrc = Yes Dentist _subpop_1: edurc = Less than HS _subpop_2: edurc = HS graduate _subpop_3: edurc = At least some college _prop_1 _subpop_1 .633312 .0584333 .5187483 .7478758 _subpop_2 .442029 .0312243 .3808109 .5032471 _subpop_3 .322692 .0343688 .2553088 .3900752 _prop_2 _subpop_1 .366688 .0584333 .2521242 .4812517 _subpop_2 .557971 .0312243 .4967529 .6191891 _subpop_3 .677308 .0343688 .6099248 .7446912 Thank you for your help, Figen Karadogan ________________________________________ From: owner-statalist@hsphsun2.harvard.edu [owner-statalist@hsphsun2.harvard.edu] on behalf of Marcello Pagano [pagano@hsph.harvard.edu] Sent: Friday, June 26, 2009 1:38 PM To: statalist@hsphsun2.harvard.edu Subject: Re: st: Analyzing a subpopulation in Stata 10.1 No, don't, Figen. This creates havoc for a lot of people. Direct people to a website if need be. The FAQ is there for a reason. Thanks, m.p. Karadogan, Figen wrote: > Hello, > > I do apologize for the attachment, but given the complexity of the question I would like to provide you all the information I have. > > Please find the result of my output attached. There, I would like to find out the proportion of diabetics older than 25yrs old, who go to dentist by education. The N of cases jointly non-missing on diabetes (dmrc_dum), dentist (dentistrc), age older than 25 (agerc25), education (edurc) is 3772. The N of cases jointly non-missing on diabetes and dentist is 3783. > > > I know that Stata needs information from every observation in the sample to compute the variance, standard error and confidence intervals even though only the information in the subsamples is needed to compute proportions. But, I am confused which one of those syntaxes gives me the correct total number of observations = 3772 or 3783?? > > Thank you very much for your help. > > Figen Karadogan > * * 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: Analyzing a subpopulation in Stata 10.1***From:*"Michael I. Lichter" <MLichter@Buffalo.EDU>

**References**:**st: Analyzing a subpopulation in Stata 10.1***From:*"Karadogan, Figen" <fo145502@ohio.edu>

**Re: st: Analyzing a subpopulation in Stata 10.1***From:*Marcello Pagano <pagano@hsph.harvard.edu>

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