| add1-drop1 {gRc} | R Documentation |
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 class 'rcox'
add1(object, scope, details = 0, trace = 0, ...)
## S3 method for class '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 |
... |
Additional arguments, currently unused. |
stat |
Either "wald" for a Wald statistic or "dev" for a deviance statistic. |
Value
A list with entries * tab: A dataframe with the test results * cc: A list of colour classes
Note
* Note that the keyword 'stat' is not available for add1 because this function expands the current model and hence the Wald statistic is not available.
* Based on fitting a new model for each new ecc, and may hence be slow.
Author(s)
Søren Højsgaard, sorenh@math.aau.dk
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