firstm {daewr}

Find first term to enter forward stepwise regression that preserves model hierarchy

Description

This function finds the first term to enter a hierarchical forward stepwise regression. If the term is an interaction or quadratic term, the parent main effects are also included. This function is called by ihstep.R

Usage

firstm(y,des)

Arguments

y

input - this is a data frame containing a single numeric column of response data.

des

input - this is a data frame containing the numeric columns of the candidate independent variables. The column names of des are of length 1. The m three-level factors always preceed the c two-level factors in the design.

Value

returned vector of terms to be entered in the model at the first step.

Author(s)

John Lawson