add1drop1 {gRc} | R Documentation |
Make a test for adding/dropping all colour classes in scope for an RCOX model.
## 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", ...)
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. |
A list with entries:
tab |
A data frame with the test results |
cc |
A list of colour classes |
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.
Søren Højsgaard, sorenh@agrsci.dk
comparecc
,
stepadd1
,
stepdrop1
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