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help for qcount
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Quantile Regression for Count Data

        qcount  depvar [varlist] [if exp] [in range] , quantile(number) [
             repetition(integer)]

               Note: the number in quantile should be in the interval (0,1).

After estimation, marginal effects (at the mean of the explanatory variables)
are obtained as:

        qcount_mfx [if exp] [in range]

Description

qcount estimates quantile regression models for count data using the jittering
method suggested by Machando and Santos Silva (2005).

Options

Quantile(number) specifies the quantile to be estimated. This is a required
    option.
  

repetition(integer) specifies the number of jittered samples to be used to
calculate the parameters of the model. If no specified, 1000 repetitions is the
default.

Examples

        . qcount y x1 x2, q(0.5) rep(5000)
        . qcount_mfx

Author

    Alfonso Miranda (A.Miranda@econ.keele.ac.uk) Centre for Economic
             Research, Keele University, Keele, Staffordshire ST5 5BG, UK.

References
(available from the author)

    Machado, J., Santos Silva, J.M.C. (2005) Quantiles for Counts. Journal of
             the American Statistical Association 100, 1226--1237.

    Miranda, A. Planned Fertility and Family Background: A Quantile
             Regression for Counts Analysis. Journal of Population Economics
             (forthcoming).

Also see

    Manual:  [U] 23 Estimation and post-estimation commands,
             [U] 29 Overview of Stata estimation commands,

    Online:  help for qreg.