help buckley
                                                              (SJ-5-4: 517-526)
-------------------------------------------------------------------------------

Title

    buckley --    Buckley-James method for analysing censored data



Syntax

        buckley depvar censorvar varlist [, options]

    options                Description
    -------------------------------------------------------------------------
    Main
      iterate(#)           specifies the maximum number of iterations
      tolerance(#)         specifies the convergence criterion
      dispnum(#)           specifies how frequently to display the iteration
    -------------------------------------------------------------------------


Description

    buckley uses the Buckley-James method (Buckley and James 1979) to
    estimate the regression coefficients and generate the expected value of
    the censored outcome.  depvar is the dependent variable whose value is
    rightly censored when the censoring variable censorvar=1.  Otherwise it
    is observed exactly when censorvar=0.  varlist is a list of explanatory
    variable names. At least one explanatory variable must be specified.


Options

        +------+
    ----+ Main +-------------------------------------------------------------

    iterate(#) specifies the maximum number of iterations allowed in the
        optimization.  It must be a positive integer. The default is
        iterate(100).

    tolerance(#) specifies the convergence criterion defined as the change of
        the sum of squares of the difference of regression coefficients
        between iterations.  It must be a positive number between 0 and 1.
        The default is tolerance(1e-6).

    dispnum(#) specifies how frequently to display the iteration; For
        example, dispnum(50) displays every 50th iteration. # must be a
        positive integer. The default is dispnum(100).


Examples

    use aids, clear

    gen censor = 1 - aids

    gen age30 = age - 30

    buckley time censor age30, i(20) t(1e-6) d(10)

    tabstat time varbj, by(aids) stats(n mean sd min max) col(stats) f(%7.2f)
        long


Also see

    SJ-5-4: 517-526


References

    Buckley J, James I. Linear regression with censored data. Biometrika
        1979; 66: 429-436.

    Cui J. Buckley-James method for analyzing censored data, with an
        application to a cardiovascular disease and an HIV/AIDS study. Stata
        Journal 2005; 4: 517-526.


Author

    James Cui, Department of Epidemiology and Preventive Medicine, Monash
    University.

    Email: james.cui@med.monash.edu.au


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