The Point Scale's reliability coefficient is .968, with a probable error of 13.7 points and a mental-age probable error of about 3.4 months¶

Claim · All claims
Evidence · 1 study · design r2 · q2
Currency · newest study 1917 · not yet checked against its sources · not reviewed by a person

Subclaims¶

q2 i? The reliability coefficient of the Point Scale is .968, its probable error is 13.7 points, and the probable error of a mental age by the scale is approximately 3.44 months, comparable to the Stanford Revision of the Binet Scale. → Arthur S. Otis 1917

Evidence¶

Arthur S. Otis 1917¶

Arthur S. Otis. (1917). An Absolute Point Scale for the Group Measurement of Intelligence.—Part II. The Journal of Educational Psychology. https://doi.org/10.1037/h0074753

q2 · i? · design · r2

Analytical computation from the correlation between Scale I and Scale II, using the standard deviation of point scores (111 points). The author computes "P. E. = .6745 v/1 - .968 x 111 = 13.7," noting this is 2.7% of the median score of 500, and derives a mental-age probable error of 3.44 months using an age standard deviation of 28.1 months.

"P. E. = .6745 v/1 - .968 x 111 = 13.7"

Discussion¶

Related Claims¶

• The Yerkes-Bridges Point Scale scoring method fails entirely to accomplish its stated purpose of bringing out the full value of the test material. — related