gRc (version 0.4-3.2)

add1drop1: 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", ...)

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

stat

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

…

Additional arguments, currently unused.

Value

A list with entries:

tab

A data frame with the test results

cc

A list of colour classes

See Also

comparecc, stepadd1, stepdrop1

Examples

# NOT RUN {
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
# }