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From |
"Nichols, Austin" <ANichols@ui.urban.org> |

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

Subject |
st: RE: Why do i get a failure all the time with this message? |

Date |
Fri, 27 Aug 2004 13:53:04 -0400 |

No, the count should be 208. You create indicator variables (taking on values 0 or 1 only) and then -summarize- them, so the mean of the 0/1 variable is the proportion of individuals who have the variable equal to 1. The sample over which the mean is computed includes the 0s and the 1s. The count will bigger than the relevant subpopulation when you use the svy commands, since -svymean x, subpop(repcell1)- uses all the data, not just the people with repcell1==1, for better variance estimates. Read -help svy- and linked resources for more info. -----Original Message----- From: jebeling [mailto:ebeling1@earthlink.net] Sent: Friday, August 27, 2004 1:17 PM To: statalist@hsphsun2.harvard.edu Subject: st: Why do i get a failure all the time with this message? I"ve tried to send this to you several times. I get an error message every time I try, but here is what I wanted to send. I'm confused by something in svymean and repcat. Here is what I've done: I've created some repcat categories using a variable I've created from the joint cell frequencies on a crosstabulation I've been using, and I want to use the ci's for each of the joint frequencies. So I did the following: . tab cells cells | Freq. Percent Cum. ------------+----------------------------------- 1 | 47 22.60 22.60 2 | 51 24.52 47.12 3 | 49 23.56 70.67 4 | 61 29.33 100.00 ------------+----------------------------------- Total | 208 100.00 . tab cells, gen(repcell) cells | Freq. Percent Cum. ------------+----------------------------------- 1 | 47 22.60 22.60 2 | 51 24.52 47.12 3 | 49 23.56 70.67 4 | 61 29.33 100.00 ------------+----------------------------------- Total | 208 100.00 . ci repcell1 Variable | Obs Mean Std. Err. [95% Conf. Interval] -------------+-------------------------------------------------------------- - repcell1 | 208 .2259615 .0290679 .1686545 .2832686 . ci repcell2 Variable | Obs Mean Std. Err. [95% Conf. Interval] -------------+-------------------------------------------------------------- - repcell2 | 208 .2451923 .029901 .1862427 .3041419 . ci repcell3 Variable | Obs Mean Std. Err. [95% Conf. Interval] -------------+-------------------------------------------------------------- - repcell3 | 208 .2355769 .029495 .1774279 .293726 . ci repcell4 Variable | Obs Mean Std. Err. [95% Conf. Interval] -------------+-------------------------------------------------------------- - repcell4 | 208 .2932692 .0316428 .2308857 .3556527 . Now shouldn't the samples be 47, 51, 49, and 61 for each of the confidence intervals I've created ci's for? I used the joint probabilities found in cells, which is derived from a crosstabulation for the repcell categories. If anyone can clear me up on this I would appreciate it. jon ebeling * * 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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