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Help on far5                                            A. Babiker 18/11/96
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Floating absolute risk for Cox and Conditional logit regression v5.0
 
Command line:
 
  ^far5^ depvar factor [^if^ exp] [^in^ range] [, ^cov^ars^(^varlist^)^
  ^cm^d^(^command^) de^ad^(^var^) rat^es ^gr^oup^(^var^) ef^orm 
other
  ^cox^ or ^clogit^ options]

^factor^      = the categorical variable with k>2 levels for which 
floating
                absolute risks are to be calulated
^cmd(str)^    = regression command (cox or clogit)
^covars(str)^ = covariates to be fitted in addtion to ^factor^
^rates^       = use overall crude rate to estimate floating adjusted 
rates.
                (Allowed with ^cox^)
 
Results can be redisplayed by entering the command. ^ef^orm 
displays results
in terms of odds ratio for clogit or hazard ratio for cox without 
^ra^tes 
option. With ^ra^tes option in ^cox^ results are displayed in terms of 
log 
absolute hazard (`noef^orm) or absolute hazard (^ef^orm).


Examples
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 . ^far5 time stage, dead(d) ef^

 . ^far5 time stage, dead(d) rates^

 . ^far5 time stage, cmd(clogit) group(centre) ^

 . ^far5, level(99) ef^    [redisplay using odds ratio and 99% conf 
limits]
 
Also see
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Manual:  [5s] clogit, cox

Reference
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Easton DF, Peto J and Babiker AG,
"Floating absolute risk: An alternative to relative risk in survival and
 case-control analysis avoiding an arbitrary reference group",
Stats in Med, 10(1991), 1025-1035.


Abdel G. Babiker
MRC HIV Clinical Trials Centre
University College London Medical School
Mortimer Market Centre
London WC1E 6AU
UK
