 ተመልከት Hansen and Bowers (2008) ቼክ ሚዛናዊ, እና ለማየት እስታቲስቲካዊ ለመቅረብ Mutz and Pemantle (2015) ቀሪ ቼክ በተመለከተ አሳሳቢ ነው.
Onani Hansen and Bowers (2008) kuti Mutz and Pemantle (2015) mayeso ndi Mutz and Pemantle (2015) chifukwa cha nkhawa zowunika.