title: An attempted validation study of the birthdate-based biorhythm (BBB) hypothesis.
abstract: The birthdate-based biorhythm (BBB) hypothesis was examined for utility as a predictor of human performance. Data from quizzes of 26 students taken periodically throughout a semester, and measures over 1 month of landing performance by seven pilots were analyzed by multiple regression/correlation methods. Regression equations were developed to test the correspondence between performance and cycle phases. A second analysis used a nonorthogonal least-square spectrum method to determine if the data contained any systemic rhythms in the intradian range. No significant results were obtained whcih would support the BBB hypothesis as a predictor of human performance. Also, no evidence was found to substantiate the existence of the three proposed BBB cycles.
mesh_terms: D000293:Adolescent; D000328:Adult; D001683:Biological Clocks; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010507:Periodicity; D013647:Task Performance and Analysis