International Journal of Obesity Supplements · 2015 · 17 citations · 15 references
EducationEducational AssessmentPhysical EducationPhysical ActivityPhysical Activity AssessmentPhysical Activity For ChildrenPhysical Activity PromotionPhysical FitnessAssessment In Physical EducationChildhood Physical ActivityPhysical Activity EnvironmentsSchool Environments
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The Measurement of Observer Agreement for Categorical Data
J. Richard Landis, Gary G. Koch · Biometrics · 1977 · 78.9K citations · Full text