### 6.1 Module Factor

IDAMS module Factor carries out:

- Principal components analysis of three types of data matrices
derived from the original
*n **´** p* matrix: (i) matrix of cross-products, (ii)
covariance matrix and (iii) correlation matrix.
- Correspondence analysis.

The program can handle principal and supplementary elements (variables,
objects). Principal variables are those, which participate in the determination
of factorial axes, whereas supplementary variables are those, which do not participate
in the determination of factorial axes, but they are projected onto the
factorial axes.