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From |
Nick Winter <nw53@cornell.edu> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: svrest & svresttest commands |

Date |
Tue, 15 Jun 2004 09:42:58 -0400 |

At 03:47 PM 6/14/2004 -0700, you wrote:

Greetings,Hi everyone, I am using the svrmean command to calculate the mean of variable by race and gender. I then want to see if difference in mean between males and females among whites is significantly different from the gender difference in other races. I gather that fro this I need to use the svrest and svresttest commands. However, I do not know how to access the mean values after the estimation command and do the test. This is what I am doing (0 and 1 stand for males and females respectively): . svrest "svrmean usc, by (smallrace pcpreq)" "[white]0-[white]1-[latino]0+[latino]1" error when command executed on original dataset invalid syntax r(101); Please help. Thanks. Arpita

As author of these programs, I'll take a crack at this.

I think in this case you don't actually need -svrest-, since you can use -svrmean- to get the basic means and their (co)variances. -svrest- is designed to let you do replication-based variance estimation for models and commands that don't have prepackaged svr-based programs already; this is not the case for means. (Think heckman, or user-written -nl- programs, etc.)

So in this case you can just use -svrmean-, followed by -test-:

. svymean usc, by(smallrace pcpreq)

. test [usc]1-[usc]2-[usc]3+[usc]4=0

(You will need to look at the handy key provided by -svrmean- to get the mappings between values of your by() variables and the values 1, 2, 3 and 4 displayed in the output).

Note also that -test- now recognizes the fact that the previous command was a -svy-command, so there is no need for -svytest-; my -svr- commands masquerade as -svy- commands in this context, so the adjusted test gets done.

--Nick Winter

--------------------------------------------------------

Nicholas Winter 607.255.8819 t

Assistant Professor 607.255.4530 f

Department of Government nw53@cornell.edu e

308 White Hall falcon.arts.cornell.edu/nw53 w

Cornell University

Ithaca, NY 14853-4601

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**Follow-Ups**:**Re: st: svrest & svresttest commands***From:*Nick Winter <nw53@cornell.edu>

**References**:**st: svrest & svresttest commands***From:*"Chattopadhyay, Arpita" <achat@medsfgh.ucsf.edu>

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