Power Table for Effect Size d

Tabled entries are power to detect an effect size equal to the column of sample values. Table values represent the number of participants per condition (n) needed to obtain a significant result at the given alpha for the effect size and power level. This power table for effect size d was prepared using the program GPOWER. Tabled entries are power to detect an effect size equal to the column header with a sample whose size is the row header.

Two-Tailed α= .05 or One-Tailed α= .025
Power	0.10	0.20	0.30	0.40	0.50	0.60	0.70	0.80	1.0	1.20	1.40
0.25	332	84	38	22	14	10	8	6	5	4	3
0.50	769	193	86	49	32	22	17	13	9	7	5
0.60	981	246	110	62	40	28	21	16	11	8	6
2/3	1144	287	128	73	47	33	24	19	12	9	7
0.70	1235	310	138	78	50	35	26	20	13	10	7
0.75	1389	348	155	88	57	40	29	23	15	11	8
0.80	1571	393	175	99	64	45	33	26	17	12	9
0.85	1797	450	201	113	73	51	38	29	19	14	10
0.90	2102	526	234	132	85	59	44	34	22	16	12
0.95	2600	651	290	163	105	73	54	42	37	19	14
0.99	3675	920	409	231	148	103	76	58	38	27	20
Two-Tailed α= .01 or One-Tailed α= .005
Power	0.10	0.20	0.30	0.40	0.50	0.60	0.70	0.80	1.0	1.20	1.40
0.25	725	183	0.82	47	31	22	17	13	9	7	6
0.50	1329	333	149	85	55	39	29	22	15	11	9
0.60	1603	402	180	102	66	46	34	27	18	13	10
2/3	1810	454	203	115	74	52	39	30	20	14	11
0.70	1924	482	215	122	79	55	41	32	21	15	12
0.75	2108	528	236	134	86	60	45	35	23	17	13
0.80	2338	586	259	148	95	67	49	38	25	18	14
0.85	2611	654	292	165	106	74	55	43	28	20	15
0.90	2978	746	332	188	120	84	62	48	31	22	17
0.95	3564	892	398	224	144	101	74	57	37	26	20
0.99	4808	1203	536	302	194	136	100	77	50	35	26

In the above power table for effect size d, two-tailed and one-tailed alpha values are calculated for Two-Tailed α = .05, .01 or One-Tailed α= .025, .005.

Power Table for Effect Size d

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