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From |
"Sayer, Bryan" <BSayer@s-3.com> |

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

Subject |
st: RE: svy commands |

Date |
Mon, 21 Oct 2002 14:49:41 -0400 |

In general, you don't use the -if option with survey commands. That is equivalent to saying the observations excluded by the -if statement are not in the population sampled from. Use either the by option or subpop(); Personally, I prefer a table showing all values, that is make "producti" a row variable of a table with -svytab-. Bryan Sayer Statistician, SSS Inc. bsayer@s-3.com -----Original Message----- From: Theodoropoulos, N. [mailto:nt18@leicester.ac.uk] Sent: Monday, October 21, 2002 2:46 PM To: statalist@hsphsun2.harvard.edu Subject: st: svy commands Dear statalisters, I am using the survey commands in Stata to find some means. I have removed all the stratums in which one psu (primary sampling unit) is detected. I check that there is no stratum with one psu for all my variables by using the svydes command. I don't have problems to get the invididual means for the individual variables "general" and "producti". However when i want to find the mean of the "general" variable given that "producti" variable is equal to zero i get the message that a stratum with one psu is detected. The "general" variable is continuous, and the "producti" variable is binary. Any hints will be highly appreciated. Thanks in advance. Here is a copy of the output that i get. svymean general Survey mean estimation pweight: empwt_nr Number of obs = 1727 Strata: newstr1 Number of strata = 44 PSU: newpsu1 Number of PSUs = 162 Population size = 1200.4609 ---------------------------------------------------------------------------- -- Mean | Estimate Std. Err. [95% Conf. Interval] Deff ---------+------------------------------------------------------------------ -- general | 4.156863 .0044976 4.147957 4.16577 2.432631 ---------------------------------------------------------------------------- -- . svymean producti Survey mean estimation pweight: empwt_nr Number of obs = 1727 Strata: newstr1 Number of strata = 44 PSU: newpsu1 Number of PSUs = 162 Population size = 1200.4609 ---------------------------------------------------------------------------- -- Mean | Estimate Std. Err. [95% Conf. Interval] Deff ---------+------------------------------------------------------------------ -- producti | .3359512 .0475784 .2417331 .4301693 17.51394 ---------------------------------------------------------------------------- -- . svymean general if producti==0 stratum with only one PSU detected r(460); * * 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/

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