In the Yerkes-Bridges alteration of the Binet Scale, equal point increments are assigned to digit-span steps whose growth intervals, as placed in the Binet Scale, are approximately 1, 3, 3, and 4 years.¶

Claim · All claims
Evidence · 1 study · theoretical r3 · q2
Currency · newest study 1917 · not yet checked against its sources · not reviewed by a person

Subclaims¶

q2 i? Points assigned to repeating 3, 4, 5, 6, and 7 digits (1, 2, 3, 4, 5 points) implicitly assume equal increments of mental growth, but the Binet placement of these tests indicates growth intervals of approximately 1, 3, 3, and 4 years. → ARTHUK S. OTIS (Stanford University) 1917

Evidence¶

ARTHUK S. OTIS (Stanford University) 1917¶

ARTHUK S. OTIS (Stanford University). (1917). A Criticism of the Yerkes-Bridges Point Scale, with Alternative Suggestions. The Journal of Educational Psychology, Vol. VIII, No. 3. https://eric.ed.gov/?q=Otis+criticism+Yerkes-Bridges+point+scale

q2 · i? · theoretical · r3

Scale-construction critique in the specific-criticism section. The article notes that the abilities to repeat series 3 to 7 digits are assigned 1 through 5 points, yet Binet placement shows growth intervals of "approximately 1, 3, 3, and 4 years respectively", so the point values are not equal increments. Evidence is the article's analysis of the printed scale, not a new data collection.

"the amounts of growth necessary to gain these four increments of ability, 3 to 4, 4 to 5, 5 to 6, and 6 to 7, digits are found to be approximately 1, 3, 3, and 4 years respectively, as indicated by the placement of these tests in the Binet Scale."

Discussion¶

Related Claims¶

• Arbitrarily assigned point values in the Yerkes-Bridges scale yield implausible growth-rate results, such as intellectual ability increasing more than fifty per cent during the fourth year and only approximately fifteen per cent during the seventh. — a broader claim this one bears on
• IQs obtained by dividing mental by chronological age remain fairly constant up to the age of 14, which supports treating yearly increments of intelligence as equal absolute units up to about age 14. — related
• 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
• Yerkes-Bridges coefficients of intelligence of 1.20 or more are attained by very different percentages of children at successive ages (34.5% at ages 4-5 down to 0% at ages 16-17 and 18-on), so they do not represent the same degree of brightness at all ages. — related
• Psychological studies of children's endowments show schools must set different aims and materials for different classes of children, and have broken up lock-step promotion — related
• The Binet-Simon and Yerkes Point Scale ratings of children run parallel and are practically identical up to age ten — related
• Per cent solved is a variable, not a constant unit of difficulty, and is not comparable across groups — related
• Scaling is a sine qua non for experimental use of tests, and unscaled tests interpreted as scaled do harm — a broader claim this one bears on