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| From | jpitblado@stata.com (Jeff Pitblado, StataCorp LP) |
| To | statalist@hsphsun2.harvard.edu |
| Subject | Re: st: subpop() and over() with survey mean estimation using SDR weights |
| Date | Mon, 30 Jan 2012 16:06:44 -0600 |
Sam Schulhofer-Wohl <sschulh1.work@gmail.com> is getting a syntax error from the -svy:- prefix when using SDR weights with a -subpop()- and -mean, over()-: > I get a syntax error message, r(198), when I try to estimate a survey > mean using both the subpop() and over() options and SDR weights. > > I can't find any indication in the manual that this combination of > options and weights is not allowed. Also, for other kinds of weights, > there is no error. Some examples are below. > > Has anyone run into this problem before? If so, any suggestions on how > to solve it? (Obviously, I can make a new variable that combines my > over() and subpop() categories, but in the particular analysis I'm > using, it would be more convenient to be able to use over() and > subpop() simultaneously.) We are able to reproduce the syntax error and believe that this is a bug in -svy sdr-. We hope to have this fixed in a future update in Stata 12. In the mean time, Sam can trick the -svy bootstrap- prefix to produce the SDR standard errors by using option -bsn(4)- with the SDR weights -svyset- as -bsrweight()- instead. Assuming that only the SDR weight variables are prefixed 'pwgtp' Sam's -svyset- command would be . svyset [pw=pwgtp], bsrweight(pwgtp?*) bsn(4) vce(bootstrap) --Jeff jpitblado@stata.com This is Sam's example: > *example of the error using SDR weights > > . webuse ss07ptx, clear > > . svyset > > pweight: pwgtp > VCE: sdr > MSE: off > sdrweight: pwgtp1 pwgtp2 pwgtp3 pwgtp4 pwgtp5 pwgtp6 pwgtp7 pwgtp8 pwgtp9 > pwgtp10 pwgtp11 pwgtp12 pwgtp13 pwgtp14 pwgtp15 pwgtp16 pwgtp17 > pwgtp18 pwgtp19 pwgtp20 pwgtp21 pwgtp22 pwgtp23 pwgtp24 pwgtp25 > pwgtp26 pwgtp27 pwgtp28 pwgtp29 pwgtp30 pwgtp31 pwgtp32 pwgtp33 > pwgtp34 pwgtp35 pwgtp36 pwgtp37 pwgtp38 pwgtp39 pwgtp40 pwgtp41 > pwgtp42 pwgtp43 pwgtp44 pwgtp45 pwgtp46 pwgtp47 pwgtp48 pwgtp49 > pwgtp50 pwgtp51 pwgtp52 pwgtp53 pwgtp54 pwgtp55 pwgtp56 pwgtp57 > pwgtp58 pwgtp59 pwgtp60 pwgtp61 pwgtp62 pwgtp63 pwgtp64 pwgtp65 > pwgtp66 pwgtp67 pwgtp68 pwgtp69 pwgtp70 pwgtp71 pwgtp72 pwgtp73 > pwgtp74 pwgtp75 pwgtp76 pwgtp77 pwgtp78 pwgtp79 pwgtp80 > Single unit: missing > Strata 1: <one> > SU 1: <observations> > FPC 1: <zero> > > . set seed 12345 > > . gen mysubpop=(uniform()<.5) > > . svy, subpop(mysubpop): mean agep, over(sex) > (running mean on estimation sample) > > SDR replications (80) > ----+--- 1 ---+--- 2 ---+--- 3 ---+--- 4 ---+--- 5 > .................................................. 50 > .............................. > invalid syntax > r(198); > > *no error if I use only over() > > . svy: mean agep, over(sex) > (running mean on estimation sample) > > SDR replications (80) > ----+--- 1 ---+--- 2 ---+--- 3 ---+--- 4 ---+--- 5 > .................................................. 50 > .............................. > > Survey: Mean estimation Number of obs = 230817 > Population size = 23904380 > Replications = 80 > > Male: sex = Male > Female: sex = Female > > -------------------------------------------------------------- > | SDR > Over | Mean Std. Err. [95% Conf. Interval] > -------------+------------------------------------------------ > agep | > Male | 33.24486 .0470986 33.15255 33.33717 > Female | 35.23908 .0386393 35.16335 35.31481 > -------------------------------------------------------------- > > > *no error if I use only subpop() > > . svy, subpop(mysubpop): mean agep > (running mean on estimation sample) > > SDR replications (80) > ----+--- 1 ---+--- 2 ---+--- 3 ---+--- 4 ---+--- 5 > .................................................. 50 > .............................. > > Survey: Mean estimation Number of obs = 230817 > Population size = 23904380 > Subpop. no. obs = 115334 > Subpop. size = 11954384 > Replications = 80 > > -------------------------------------------------------------- > | SDR > | Mean Std. Err. [95% Conf. Interval] > -------------+------------------------------------------------ > agep | 34.17763 .0666841 34.04693 34.30833 > -------------------------------------------------------------- > > > *no error when using subpop() and over() with pweights > *(example from page 62 of [SVY]) > > . use http://www.stata-press.com/data/r12/nmihs, clear > > . svyset > > pweight: finwgt > VCE: linearized > Single unit: missing > Strata 1: stratan > SU 1: <observations> > FPC 1: <zero> > > . generate nonblack = (race == 0) if !missing(race) > > . svy, subpop(nonblack): mean birthwgt, over(marital age20) > (running mean on estimation sample) > > Survey: Mean estimation > > Number of strata = 3 Number of obs = 4724 > Number of PSUs = 4724 Population size = 3230403 > Subpop. no. obs = 4724 > Subpop. size = 3230403 > Design df = 4721 > > Over: marital age20 > _subpop_1: single age20+ > _subpop_2: single age<20 > _subpop_3: married age20+ > _subpop_4: married age<20 > > -------------------------------------------------------------- > | Linearized > Over | Mean Std. Err. [95% Conf. Interval] > -------------+------------------------------------------------ > birthwgt | > _subpop_1 | 3312.012 24.2869 3264.398 3359.625 > _subpop_2 | 3244.709 36.85934 3172.448 3316.971 > _subpop_3 | 3434.923 8.674633 3417.916 3451.929 > _subpop_4 | 3287.301 34.15988 3220.332 3354.271 > -------------------------------------------------------------- > Note: 3 strata omitted because they contain no subpopulation > members. > * > * 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/