gRc (version 0.5.1)

add1-drop1: Add or drop colour classes to RCOX models

Description

Make a test for adding/dropping all colour classes in scope for an RCOX model.

Usage

# S3 method for rcox
add1(object, scope, details = 0, trace = 0, ...)
# S3 method for rcox
drop1(object, scope, details = 0, trace = 0, stat = "wald", ...)

Value

A list with entries * tab: A dataframe with the test results * cc: A list of colour classes

Arguments

object

An RCOX model, an object of class 'rcox'

scope

A set of edge colour classes to be considered for addition or deletion, see 'details'.

details

Control the amount of output created.

trace

For debugging purposes

...

Additional arguments, currently unused.

stat

Either "wald" for a Wald statistic or "dev" for a deviance statistic.

Author

Søren Højsgaard,

See Also

comparecc, stepadd1, stepdrop1.

Examples

data(math)
gc.sat <- ~me:ve:al:st:an
gc.1   <- ~me+ve+al+st+an

m.sat <- rcox(gm=gc.sat, data=math)
m.1   <- rcox(gm=gc.1,   data=math)

t.sat <- drop1(m.sat)
t.sat$tab
t.sat$cc

t.1   <- add1(m.1)
t.1$tab
t.1$cc