{
const union value *group = case_data (c, nst->indep_var);
const size_t group_var_width = var_get_width (nst->indep_var);
- const double rank = case_data_idx (c, rank_idx)->f;
+ const double rank = case_num_idx (c, rank_idx);
if (value_equal (group, &nst->val1, group_var_width))
{