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st: Ask for help regarding colelms


From   "Duong, Hao Thi" <Hao.T.Duong@uth.tmc.edu>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Ask for help regarding colelms
Date   Mon, 13 Nov 2006 22:35:38 -0600

Dear
I would like to ask for your help about the command colelms.
The command runs funny to me:
. colelms  BMI_b, agegroup(cdcage_b) sex(gender) nosmooth
(10 missing values generated)
(10 missing values generated)
(10 missing values generated)
(10 missing values generated)
(10 missing values generated)
First, it gives missing values. Second, it calculates once for observations have the same agegroup. Although age is same, sex and BMI are diffirent so i expect to see different L, M, and S values.
Also, I do not know how to set the value of df and its function in this command in the syntax below given by "help"
  colelms yvar, agegroup(var) [sex(var) centile(# # #) df(#) nosmooth]
If anyone knows, please help.
Thank you


Hao Duong, M.D., M.P.H.
Dr.P.H. Candiate in Health Promotion & Health Education
University of Texas Health Science Center Houston,
School of Public Health
Email: hao.t.duong@uth.tmc.edu

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