Terry A. Ackerman

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Differential item functioning (DIF) analyses are used to identify items that operate differently between two groups. Three popular DIF methods—Mantel-Haenszel (MH), Simultaneous Item Bias Test (SIBTEST) and logistic regression (LR)—match examinees on a conditioning variable to ensure that the two groups are comparable to one another. However, in some(More)
BACKGROUND Anterior cruciate ligament (ACL) injuries often occur during landing, with female athletes at higher injury risk than male athletes. Interestingly, female dancers have lower ACL injury rates than do female athletes in general. HYPOTHESIS Female dancers will have earlier and greater lower extremity muscle activity and higher sagittal knee joint(More)
description the computer uses to generate instances of a class is called an item “model” and the instances are called “variants.” (Drasgow et al., 2006). The term item variant is also used to refer to instances of an item model that range in difficulty or some other psychometric characterization of the items (Bejar 2002).
Taylor, JB, Ford, KR, Schmitz, RJ, Ross, SE, Ackerman, TA, and Shultz, SJ. Biomechanical differences of multidirectional jump landings among female basketball and soccer players. J Strength Cond Res 31(11): 3034-3045, 2017-Anterior cruciate ligament (ACL) injury prevention programs are less successful in basketball than soccer and may be due to distinct(More)
The authors examined the mediational role of drinking motives in explaining the associations among psychosocial antecedents and collegiate drinking. Results indicated that drinking motives partially mediated the relationships between outcome expectancies, perceived norms, alcohol use intensity, and alcohol-related negative consequences.
Debate exists as to whether improvements in some cardiometabolic risk factors following exercise training result more from the last session of, or from an accumulation of, exercise sessions. This study was designed to compare the effect of a single exercise session with 3 consecutive days of exercise on triglyceride (TG), high-density(More)
High-stakes tests are widely used as measurement tools to make inferences about test takers’ proficiency, achievement, competence or knowledge. The stakes may be directly related to test performance, such as obtaining a high-school diploma, being granted a professional license or certificate, etc. Indirect stakes may include state accountability where test(More)
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