A ọnụ ọgụgụ kasị elu n'ime mgbanwe site na mbụ na nke abụọ oge na nnyocha e mere nnyocha bụ Groves and Kahn (1979) , nke na-eme ihe ọmụma zuru ezu isi na-isi tụnyere n'etiti a ihu na ihu na ekwentị nnyocha e mere.
