With pairwise treatment of missing values (MISSING=ANALYSIS is specified), the matrix
of Ns that is used to compute each coefficient is included with the
matrix materials.
With LISTWISE treatment, a single N that is used to calculate all coefficients
is included with the matrix materials.
When reading a matrix data file, be sure to specify
a missing-value treatment on PARTIAL CORR that is compatible with the missing-value treatment that was in
effect when the matrix materials were produced.