Table 1.

Averages for transformed data by Set Size (adjusted; N = 40 per age group)

Set Size	p(WM)	p(LTM)	LTM/WM ratio	WM capacity (k)
1st and 2nd graders
2 items	.90 (.12)	.35 (.17)	0.39 (0.19)	1.8 (0.25)
4 items	.64 (.21)	.18 (.13)	0.32 (0.28)	2.6 (0.85)
6 items	.55 (.25)	.15 (.11)	0.36 (0.40)	3.3 (1.50)
3rd and 4th graders
2 items	.93 (.07)	.48 (.21)	0.51 (0.23)	1.9 (0.14)
4 items	.74 (.16)	.24 (.14)	0.34 (0.21)	3.0 (0.64)
6 items	.61 (.20)	.17 (.13)	0.27 (0.20)	3.7 (1.20)
5th through 7th graders
2 items	.94 (.09)	.51 (.16)	0.54 (0.16)	1.9 (0.18)
4 items	.78 (.17)	.28 (.15)	0.37 (0.23)	3.1 (0.69)
6 items	.66 (.21)	.20 (.13)	0.32 (0.25)	4.0 (1.30)
College students
2 items	.97 (.06)	.50 (.19)	0.51 (0.19)	1.9 (0.12)
4 items	86 (.13)	.31 (.20)	0.36 (0.22)	3.4 (0.53)
6 items	.75 (.20)	.23 (.16)	0.31 (0.22)	4.5 (1.20)

Note. Values in Parenthesis represent Standard Deviations. Values equivalent to WM k < 1 were replaced with the corresponding p(WM) for k = 1, and values of p(LTM) × Set Size ≤ 0 were replaced with zero.