.-
help for ^dtobit^                                                 (STB-56: sg144)
.-

Marginal effects of the tobit model
------------------------------------------------------------------------------

	^dtobit^ [, ^at(^matname^)^ ^c^ensor ^b^rief ^nod^iscrete ^lev^el^(^#^)^]

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

^dtobit^ provides a table of marginal effects evaluated at the means of the
independent variables by default, or at the observed censoring rate of the
dependent variable if ^censor^ is specified, or at user specified points if
^at(^matname^)^ is specified.  The marginal effects are computed for the latent
dependent variable, the expected value of the dependent variable conditional
on being uncensored, the unconditional expected value of the dependent
variable, and the probability of being uncensored.  For dummy variables, by
default, ^dtobit^ will report the discrete changes unless the ^nodiscrete^
option is specified.


Options
-------

^at(^matname^)^ specifies the points around which the marginal effects are
   to be estimated. The default is to estimate the effects around the means
   of the independent variables.

^censor^ specifies that the marginal effects should be evaluated at the
   observed censoring rate of the dependent variable. This option is not
   allowed with two-tailed censoring case. ^at(^matname^)^ and ^censor^ cannot be
   specified at the same time.

^brief^ will simplify the output.  Standard deviations of the estimates and
   the confidence intervals will be excluded from the table.

^nodiscrete^ treats dummy variables as continuous ones. If nodiscrete is not
   specified, the marginal effect of a dummy variable is calculated as the
   discrete change in the expected value of the dependent variable as the
   dummy variable changes from 0 to 1.


Example
-------

	. ^tobit mpg trunk weight, ll(17)^
	. ^dtobit^
	. ^dtobit, brief^
	. ^dtobit, brief censor^
	. ^mat M=(12, 2500, 1)^
	. ^dtobit, at(M)^


Author
------

   Ronna Cong
   Stata Corporation
   rcong@@stata.com

Also see
--------

 Manual:  ^[U] 26 Estimation and post-estimation commands^
          ^[U] 35 Overview of model estimation^
On-line:  help for @est@; @tobit@, @intreg@, @cnreg@, @test@, @testnl@, @vce@