I'm using R's ppcor package and from there
spcor function to calculate the pairwise semi-partial (part) correlations. In my data there are 11 variables and 95 observations.
When calculating partial correlations I get a warning that "The inverse of variance-covariance matrix is calculated using Moore-Penrose generalized matrix inverse due to its determinant of zero" and some of the returned estimates are -Inf.
How should (or could) I interpret these values?