struct ccase ;
struct covariance * covariance_create (size_t n_vars, const struct variable **vars,
- const struct variable *wv, enum mv_class excl);
+ const struct variable *wv, enum mv_class excl,
+ short passes);
+
struct covariance *
covariance_2pass_create (size_t n_vars, const struct variable **vars,
size_t n_catvars, const struct variable **catvars,
const struct variable *weight, enum mv_class excl);
void covariance_accumulate (struct covariance *, const struct ccase *);
+void covariance_accumulate_pass1 (struct covariance *, const struct ccase *);
+void covariance_accumulate_pass2 (struct covariance *, const struct ccase *);
const gsl_matrix * covariance_calculate (struct covariance *cov);