“…Researchers have explained that observers tend to rate their favorite targets more highly, particularly when test items are positive questions, such as positive emotions or characters (Jussim, ; Najman et al, ). Therefore, to avoid possibly inflated correlations, we decided to exclude teacher ratings (e.g., Alan, Boneva, & Ertac, ; Barrington, ; O'Neal, ) and parent ratings (e.g., Sturman & Zappala‐Piemme, ) of grit. - Outcome measures were restricted to academic achievement, which was generally defined as the achievement of a particular result in a numerical grade in an assignment, exam, or degree within nonspecific subjects or GPA (Richardson, Abraham, & Bond, ).
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