specs.Design {Design}R Documentation

Design Specifications for Models

Description

Prints the design specifications, e.g., number of parameters for each factor, levels of categorical factors, knot locations in splines, pre-transformations, etc.

Usage

specs(fit, ...)
## S3 method for class 'Design':
specs(fit, long=FALSE, ...)

## S3 method for class 'specs.Design':
print(x, ...)

Arguments

fit a fit object created with the Design library in effect
x an object returned by specs
long if TRUE, causes the plotting and estimation limits to be printed for each factor
... ignored

Value

a list containing information about the fit and the predictors as elements

Author(s)

Frank Harrell
Department of Biostatistics, Vanderbilt University
f.harrell@vanderbilt.edu

See Also

Design, Design.trans, latex.Design, datadist

Examples

set.seed(1)
blood.pressure <- rnorm(200, 120, 15)
dd <- datadist(blood.pressure)
options(datadist='dd')
L <- .03*(blood.pressure-120)
sick <- ifelse(runif(200) <= plogis(L), 1, 0)
f <- lrm(sick ~ rcs(blood.pressure,5))
specs(f)    # find out where 5 knots are placed
g <- glmD(sick ~ rcs(blood.pressure,5), family=binomial)
specs(g,long=TRUE)
options(datadist=NULL)
[Package Design version 2.1-1 Index]