Description Usage Arguments Details Value Author(s) See Also Examples
View source: R/summary.selection.R
Print or return a summary of a selection estimation.
1 2 3 4 5 6 |
object |
an object of class ' |
x |
an object of class ' |
part |
character string: which parts of the summary to print: "full" for all the estimated parameters (probit selection, outcome estimates, correlation and residual variance), or "outcome" for the outcome results only. |
digits |
numeric, (suggested) number of significant digits. |
... |
currently not used. |
The variance-covariance matrix of the two-step estimator is currently implemented only for tobit-2 (sample selection) models, but not for the tobit-5 (switching regression) model.
Summary methods return an object of class summary.selection
.
Print methods return the argument invisibly.
Arne Henningsen, Ott Toomet otoomet@ut.ee
summary
, selection
,
and selection-methods
.
1 2 3 4 5 6 7 8 9 10 11 12 | ## Wooldridge( 2003 ): example 17.5, page 590
data( Mroz87 )
wooldridge <- selection( lfp ~ nwifeinc + educ + exper + I( exper^2 ) +
age + kids5 + kids618, log( wage ) ~ educ + exper + I( exper^2 ),
data = Mroz87, method = "2step" )
# summary of the 1st step probit estimation (Example 17.1, p. 562f)
# and the 2nd step OLS regression (example 17.5, page 590)
summary( wooldridge )
# summary of the outcome equation only
print(summary(wooldridge), part="outcome")
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