scaleChi {cocorresp}

Standardised chi-square residuals

Description

Scales a matrix, Y, to is standardised chi-square residuals (o - e) / \sqrt{e} (given K_n and R_0 metrics derived from an external matrix Y_0) so that further analysis can be unweighted.

Usage

scaleChi(Y, Kn, R0, eps = 1e-06)

Arguments

Y

a matrix for which standardised chi-square residuals are to be calculated.

Kn

the column sums (K) of Y divided by sum(K).

R0

row weights.

eps

a tolerance.

Value

Yr

the matrix of standardised chi-squared residuals of Y.

Note

This function is not intended for casual use by users.

Author(s)

Gavin L. Simpson, based on Matlab code by C.J.F. ter Braak and A.P. Schaffers.

References

Ter Braak, C.J.F and Schaffers, A.P. (2004) Co-Correspondence Analysis: a new ordination method to relate two community compositions. Ecology 85(3), 834–846