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help for ^tabodds^                                              (STB-27: ssa8)
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Tabulation of odds by a categorical exposure variable
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    ^tabodds^ fail xvar [^if^ exp] [^in^ range] [fweight] 
        [^,^ ^b^inomial^(^varname^)^ ^g^raph ^l^evel^(^#^)^ ^t^rend]


Description
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^tabodds^ tabulates the odds of failure by different levels of xvar, a cate-
gorical explanatory variable. Confidence intervals for the odds are also given.

For individual records, ^fail^ takes the values 0/1 and the ^binomial^ option is
not used.  For frequency records. ^fail^ takes the values 0/1, the ^binomial^
option is not used, and the frequencies are supplied using frequency weights.
For binomial frequency records, which contain the number of failures out of a
number of subjects, the variable ^fail^ contains the number of failures, and
the number of subjects is supplied by the ^binomial^ option.


Options
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^binomial(^varname^)^ gives the variable containing the number of subjects. 

^graph^ requests a graph of odds against xvar; graph options are allowed.

^level(^#^)^ gives the level for the confidence intervals (default 95)

^trend^ produces a test for trend.


Examples
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 . ^tabodds d smoke^              --  Individual records
 . ^tabodds D smoke, b(N)^        --  Binomial frequency records
 . ^tabodds d smoke [fweight=f]^  --  Frequency records


Authors
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        David Clayton, MRC Biostatistical Research Unit, Cambridge
        david.clayton@@mrc-bsu.cam.ac.uk
        Michael Hills, London School of Hygiene and Tropical Medicine, London
        mhills@@lshtm.ac.uk


Also see
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    STB:  STB-27 ssa9
On-line:  help for @mhodds@