reflexesC {sca}

Human Reflexes Correlation Data

Description

This correlation matrix was published in Jolliffe (2002, p.58). The data consist of measurements of strength of reflexes at ten sites of the body, taken for 143 individuals. The variables come in five pairs, corresponding to right and left measurements on triceps, biceps, wrists, knees and ankles, respectively.

Usage

data(reflexesC)

Format

It is a 10 x 10 correlation matrix, i.e. symmetric, and diagonal 1. The five pairs of variables are (in this order) "triceps.R", "triceps.L", "biceps.R", "biceps.L", "wrist.R", "wrist.L", "knee.R", "knee.L", "ankle.R", "ankle.L".

References

Jolliffe, I.T. (2002) Principal Component Analysis (2nd ed.). Springer, New York.

Examples

data(reflexesC)
symnum(reflexesC)
sca(reflexesC)  # sca gets 97.95%  of PCA