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Compute Standardized Residuals

comp_std_residuals.Rd

`comp_std_residuals` computes the standardized residual matrix S based on the Poisson model, which is the basis for correspondence analysis and serves as input for singular value decomposition (SVD).

Usage

comp_std_residuals(mat, clip = FALSE, cutoff = NULL)

Arguments

mat

A numerical matrix or coercible to one by `as.matrix()`. Should have row and column names.

clip

logical. Whether residuals should be clipped if they are higher/lower than a specified cutoff

cutoff

numeric. Residuals that are larger than cutoff or lower than -cutoff are clipped to cutoff.

Value

A named list. The elements are:

  • "S": standardized residual matrix.

  • "tot": grand total of the original matrix.

  • "rowm": row masses.

  • "colm": column masses.

Details

Calculates standardized residual matrix S from the proportion matrix P and the expected values E according to \(S = \frac{(P-E)}{sqrt(E)}\).