Probit coefficients as changes in probabilities                [STB-19: sqv9]
-----------------------------------------------

	^dprobit^ depvar indepvars [weight] [^if^ exp] [^in^ range]
		[^, at(^{^xbar^|^pbar^|#}^) cl^assic probit_options]

^aweight^s and ^fweight^s are allowed.

^dprobit^ shares the features of all estimation commands; see [4] estimate.

To reset problem-size limits, see ^help matsize^.


Description
-----------

^dprobit^ estimates maximum-likelihood probit models and is an alternative to
^probit^; see ^help probit^.  Rather than reporting the coefficients, however,
^dprobit^ reports the change in the probability for an infinitesimal change
in each independent, continuous variable and, by default, the discrete change
in the probability for dummy variables.

Description, continued
----------------------

^dprobit^ typed without arguments redisplays results.  ^probit^ may also be typed
without arguments after dprobit estimation to see the model in coefficient
form.





Options
-------

^at(^{^xbar^|^pbar^|#}^)^ specifies the point around which the transformation of
    results is to be made.  ^at(xbar)^ is the default, meaning the transformation
    is made at the predicted probability of a positive outcome evaluated at the
    means of the independent variables.  ^at(pbar)^ specifies the transformation
    is made at the observed overall fraction of positive outcomes.  ^at(^#^)^
    allows the transformation to be made around any user specified point,
    0<#<1.  ^at()^ may be specified when the model is estimated or when results
    are redisplayed.


Options, continued
------------------


^classic^ requests that the mean effects be calculated using the formula f(p)b
    in all cases.  If ^classic^ is not specified, f(p)b is used for continuous
    variables but the mean effects for dummy variables is calculated as
    F(p-b[i]x[i]+b[i]) - F(p-b[i]x[i]).  ^classic^ may be specified at estimation
    time or when results are redisplayed.


probit_options refers to any of the options of the ^probit^ command.



Examples
--------

	. ^dprobit foreign mpg goodplus^
	. ^probit^
	. ^dprobit, at(pbar)^

	. ^dprobit foreign mpg goodplus, classic^ 



Author
------

	William Gould, Stata Corporation
	FAX: 409-696-4601



Also see
--------

    STB:  sqv9 (STB-19)
 Manual:  [5s] logit
On-line:  ^help^ for ^probit^
.
.
.