void covariance_accumulate_pass2 (struct covariance *, const struct ccase *);
gsl_matrix * covariance_calculate (struct covariance *);
void covariance_accumulate_pass2 (struct covariance *, const struct ccase *);
gsl_matrix * covariance_calculate (struct covariance *);
void covariance_destroy (struct covariance *cov);
const gsl_matrix *covariance_moments (const struct covariance *cov, int m);
const struct categoricals * covariance_get_categoricals (const struct covariance *cov);
void covariance_destroy (struct covariance *cov);
const gsl_matrix *covariance_moments (const struct covariance *cov, int m);
const struct categoricals * covariance_get_categoricals (const struct covariance *cov);