(2015) na-eji a Usoro a na-akpọ dọba nlaghachi azụ na post-stratification (MRP, mgbe ụfọdụ, a na-akpọ "Mister P") na-enye ohere na-eme nnyocha na-eme atụmatụ cell pụtara ọbụna mgbe e nwere ọtụtụ, ọtụtụ mkpụrụ ndụ.
