st: Svy design statement and svydes error

[<Arnold.Levinson@UCHSC.edu>]

All,
In a two-stage sampling design, I successfully assign the following
setting:

svyset class_id [pw=w2f2f3], strata(skulid) fpc(fpc1) || unit,
strata(class_id) fpc(fpc2)

When I run -- svydes -- I get an r(198) error:

variable class_id specified more than once as a survey design
characteristic

Am I missing something? How else declare second-stage sampling within
clusters?
thx...arnold

Arnold H. Levinson, Ph.D.
Director, Tobacco Program Evaluation Group (TPEG)
Assistant Professor of Preventive Medicine
University of Colorado at Denver & Health Sciences Center
AMC Cancer Research Center
1600 Pierce Street, Lakewood CO 80214
Arnold.Levinson@uchsc.edu
303-239-3402



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