help ztnbp
-------------------------------------------------------------------------------

Title

    ztnbp -- Zero-truncated NegBin-P regression

Syntax

        ztnbp depvar [indepvars] [if] [in] [, options]

    where depvar has to be a strictly postive outcome.

    options               Description
    -------------------------------------------------------------------------
    noconstant            suppress constant term
    vce(vcetype)          vcetype may be oim, robust, cluster clustvar, or
                            opg
    maximize_options      control the maximization process; see [R] maximize
    -------------------------------------------------------------------------
    bootstrap and jackknife are allowed; see prefix.


Description

    ztnbp fits a zero-truncated Negbin-P model. Setting P=1 or P=2 gives the
    ztnb-1 (dispersion(constant)) or ztnb-2 (dispersion(mean)) model (see 
    tnbreg). Otherwise ztnbp generalizes these models in the sense that you
    get an estimate for P.

    This program uses ml lf method.


Options

    noconstant suppresses the constant term (intercept) in the model.

    vce(vcetype) specifies the type of standard error reported, which
        includes types that are derived from asymptotic theory, that are
        robust to some kinds of misspecification, and that allow for
        intragroup correlation; see [R] vce_option.

    maximize_options: difficult, technique(algorithm_spec), iterate(#),
        [no]log, trace, gradient, showstep, hessian, showtolerance,
        tolerance(#), ltolerance(#), nrtolerance(#), nonrtolerance, and
        from(init_specs); see [R] maximize.  These options are seldom used.

        difficult is the default.


Author

    Helmut Farbmacher
    Munich Center for the Economics of Aging (MEA)
    Max Planck Society, Germany
    farbmacher@mea.mpisoc.mpg.de

Reference

    Farbmacher, H. 2012: Extensions of hurdle models for overdispersed count
             data, Health Economics, forthcoming.

       Help:  [R] tnbreg, [R] ztpnm, [R] ztpflex