 De Waal, Puts, and Daas (2014) ለዳሰሳ ጥናት የተዘጋጁ የስታትስቲክስ መረጃ ማስተካከያ ቴክኒኮችን ይጠቀማሉ እና ለትልቅ የውሂብ ምንጮች Puts, Daas, and Waal (2015) ደረጃ ይመረምራል Puts, Daas, and Waal (2015) ለአብዛኞቹ ተመሳሳይ ሀሳቦች ያቀርባሉ.
De Waal, Puts, and Daas (2014) amafotokoza njira zowonetsera deta zomwe zasankhidwa kuti azifufuza deta ndikuyang'ana momwe akugwiritsira ntchito pazinthu zazikulu, komanso Puts, Daas, and Waal (2015) amapereka malingaliro ofanana omvera ambiri.