Education
Wissler received his BA in Experimental Psychology in 1897 and received his MA in 1899. Wissler married Etta Viola Gebhart on June 14, 1899 and he fathered a son and a daughter, Stanley Gebhart Wissler and Mary Viola Wissler. In 1899 Wissler was appointed assistant in psychology at Columbia University. He continued his psychology graduate work under James McKeen Cattell and he received his Ph.D. in psychology in 1901. From 1901 to 1903 Wissler performed research on individual mental and physical differences. Wissler's doctoral dissertation used the new Pearson Correlation Coefficient formula to show that there was no correlation between scores on Cattell's IQ tests and academic achievement. Wissler's dissertation eventually led the psychology movement to lose interest in psychophysical testing of intelligence.
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