Find first term to enter forward stepwise regression that preserves model hierarchy
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
firstm(y,des)
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. |
returned vector of terms to be entered in the model at the first step.
John Lawson
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