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...Personality and individual differences contents lists available at sciencedirect journal homepage www elsevier com locate paid identication problems in psychology a b c d e lex borghans bart h golsteyn james heckman john eric humphries amaastricht university tongersestraat md maastricht the netherlands bsofi stockholm universitetsvagen f se sweden cuniversity of chicago department economics th street il usa duniversity college dublin geary institute beleld ireland eamerican bar foundation north lake shore drive article info abstract history thispaperdiscussesandillustratesidenticationproblemsinpersonalitypsychology themeasuresused received march by psychologists to infer traits are based on behaviors broadly dened these produced accepted from multiple interacting with incentives situations general measures determined online may do not identify any particular trait unless other con trolled for using two data sets we show that substantial portions variance achievement test keywords score...