ensure_full_rank function

Ensure a Design Matrix has Full (Column) Rank

Determine and drop redundant columns using the qr

decomposition.

ensure_full_rank(X, tol = 1e-07, silent = FALSE, test.ans = FALSE)

Arguments

• X: a design matrix as produced by model.matrix.
• tol: qr tolerance.
• silent: throw message if columns are dropped from X? Default is FALSE.
• test.ans: Test if the resulting/returned matrix has full rank? Default is FALSE.

Returns

A design matrix in which redundant columns are dropped