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From |
"Theodoropoulos, N." <nt18@leicester.ac.uk> |

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

Subject |
st: svy commands |

Date |
Mon, 21 Oct 2002 19:46:22 +0100 |

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/

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