LogisticDx (version 0.1)

stukel: Stukels test of the logistic link

Description

Calculates Stukels test for a logistic regression model. This determines the appropriateness of the logistic link. Two new covariates, z1 and z2 are generated such that $$z1=0.5*logit^2*I(pi>=0.5), z2=-0.5*logit^2*I(pi

Usage

stukel(object,
    alternative = c("both", "alpha1", "alpha2"))

Arguments

object

An object of class glm

alternative

add both $z1$ and $z2$ to model or just one of the above

Value

• A list with the following elemens:
• statistic
  value of statistic
• parameter
  degrees of freedom
• p.value
  if $<0.05$ suggests="" should="" accept="" null="" hypothesis="" that="" logistic="" model="" is="" incorrect="" for="" the="" data<="" description="">
• alternative
  alternative
• method
  method
• data.name
  name of object
• allstat
  statistics for all tests
• allpar
  degrees of freedom
• allpval
  all p values

References

http://http://www.stat.ufl.edu/~presnell/Courses/sta7249-2008sp/R/Src/stukel.R{University of Florida}

Examples

set.seed(1)
m1 <- genLogiDf(b=3,f=0,c=0,n=50)$model
stukel(m1)