Correlation between initial ability and absolute improvement is negative but very small and unreliable in both groups¶

Claim · All claims
Evidence · 1 study · causal r1 · q3 · i1 small
Currency · newest study 1915 · not yet checked against its sources · not reviewed by a person

Subclaims¶

q3 i1 The correlation between initial ability and absolute improvement changes from -.36 to -.13 (P.E. .15) for the feeble-minded group and from -.40 to -.11 (P.E. .17) for the normal group, remaining negative but becoming very small and unreliable. → Woodrow 1915

Evidence¶

Woodrow 1915¶

Woodrow, H. (1915). Practice and transference in normal and feeble-minded children. The Journal of Educational Psychology. https://scholar.google.com/scholar?q=%22Practice+and+Transference+in+Normal+and+Feeble-Minded+Children%22

q3 · i1 · causal · r1

Correlational analysis from the same four-group practice experiment; the printed correlations r = -.13 and r = -.11 are small effects. The author states the correlation "remains negative but becomes very small (and unreliable)" when absolute rather than percentage improvement is used.

"changing for the feeble-minded group from —.36 to —.13 (P. E., .15) and for the normal group from —.40 to —.11 (P. E., .17)"

Discussion¶

Related Claims¶

• Feeble-minded children show the same amount of improvement with practice as normal children of the same mental age and initial ability on a form sorting task — related
• Children below average in initial ability improve relatively more with practice than those above average, in both feeble-minded and normal groups — related