Louis Leon Thurstone

Louis Leon Thurstone (29 May 1887 – 30 September 1955) was a U.S. pioneer in the fields of psychometrics and psychophysics. He conceived the approach to measurement known as the law of comparative judgment, and is well known for his contributions to factor analysis.

Read more about Louis Leon Thurstone:  Background and History, Factor Analysis and Work On Intelligence, Contributions To Measurement, Awards and Honors, Selected Works

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    Some people swallow the universe like a pill; they travel on through the world, like smiling images pushed from behind.
    —Robert Louis Stevenson (1850–1894)