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help for ^cenpois^                          (Statalist: Hilbe;16Dec1997)
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Censored Poisson Regression
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  ^cenpois^ [depvar [varlist] [^if^ exp] [^in^ range] ] [^, l^evel^(^#^)
          ^lt^olerance^(^#^) ^ir^r ^off^set^(^str^)^ ^CEN^sor(^str^) ]
 
 
Description
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^cenpois^ performs Poisson regression where cases are uncensored or
 left and/or right censored.
 
 
Options
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^Censor(^var^)^ specifies the variable that indicates censoring.  
    1 = not censored
    0 = left censored 
   -1 = right censored

The censor option is mandatory. To estiamte an uncensored Poisson model, 
create a variable named, e.g. cenvar, as gen cenvar=1. Then type the 
censor option as: cnpois ....., cen(cenvar).

^lt(#)^        = tolerance for convergence
^irr^          = parameter estimates displayed in exponential form; standard 
                 errors and CIs adjusted
^off(str)^     = offset variable - log raw var prior to using as offset
^nolog^        = no display of iteration log

Results may be redisplayed by entering the command. Exponential form and 
C.I. level are allowed as options without reestimation.


Examples
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 . ^cenpois studytim died drug2 drug3, irr nolog cen(cenvar)^
 
 . ^cenpois infected cases cd4 cd8, nolog irr off(cases) cen(cenvar)^

 . ^cenpois, level(90)^    [redisplay]


Also see
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Manual:  [R] poisson, cnreg
On-line:  help for @poisson@, @cnreg@

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Joseph Hilbe
Arizona State University
atjmh@@asuvm.inre.asu.edu 
jhilbe@@aol.com