Summarizing Selection Estimations
Print or return a summary of a selection estimation.
## S3 method for class 'selection'
summary(object, ...)
## S3 method for class 'summary.selection'
print(x,
digits = max(3, getOption("digits") - 3),
part = "full", ...)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.
## 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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