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Retention and Obliviscence as a Function of the Time

71

The average differences between times of learning and relearning at the different times of day vary somewhat with regard to their absolute values. (Of course in the case of B the number 254 must first be multiplied by 4/3, because it is derived from only 6 series.) But the relations of these differences to the times of first learning (the Q's) harmonize sufficiently well. If, therefore, all the Q's are combined in a general average, Q=33.7 (P.E._m=1.2).

V. Two days.⁠26 tests; 11 of these at the time A, 7 at B, 8 at C.
A
L	WL	Δ	Q
1066	895	171	17.4
1314	912	402	32.7
963	855	108	12.3
964	710	254	28.9
1242	888	354	30.6
1243	710	533	46.0
1144	895	249	23.5
1143	874	269	25.4
1149	953	196	18.4
1090	855	235	23.4
1376	847	529	41.0
m⁠1154	854	300	27.2 P.E._m=2.3

B
L	WL	Δ	Q
752	549	203	29.5
1087	740	347	33.9
1073	620	453	44.9
826	693	133	17.5
905	548	357	42.4
811	763	48	6.4
782	618	164	22.8
m⁠891	647	244	28.2 P.E._m=3.5