Add or Drop All Possible Single Terms to/from a logistf Model
Compute all the single terms in the scope argument that can be added to or dropped from the model, fit those models and compute a table of the changes in fit.
## S3 method for class 'logistf' add1(object, scope, test = "PLR", ...)
object |
A fitted |
scope |
The scope of variables considered for adding or dropping. Should be a vector of variable names. Can be left missing; the method will then use all variables in the object's data slot which are not identified as the response variable. |
test |
The type of test statistic. Currently, only the PLR test (penalized likelihood ratio test) is allowed for logistf fits. |
... |
Further arguments passed to or from other methods. |
drop1 and add1 generate a table where for each variable the penalized
likelihood ratio chi-squared, the degrees of freedom, and the p-value for dropping/adding this variable are given.
A matrix with nvar rows and 3 columns (Chisquared, degrees of freedom, p-value).
data(sex2)
fit<-logistf(data=sex2, case~1, pl=FALSE)
add1(fit, scope=c("dia", "age"))
fit2<-logistf(data=sex2, case~age+oc+dia+vic+vicl+vis)
drop1(fit2)Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.