Table 4.

Means and Standard Deviations of Means and Within-Person Standard Deviations Across the Three Sessions and Two Estimates of the Magnitude of the Within-Person Variability, Study 1 (N = 90)

	Mean		SD
Variable	M	SD	M	SD	M(SD)/SD(M)	Years cross-sect. age diff.
Vocabulary	54.7	8.6	3.6	2.5	0.42	NA
Picture vocabulary	19.6	4.9	2.1	1.2	0.43	NA
Synonym vocabulary	6.9	2.0	1.1	0.6	0.55	NA
Antonym vocabulary	6.0	2.2	1.4	0.8	0.64	NA
Matrix reasoning	7.9	3.7	1.6	0.8	0.43	14.5
Letter sets	11.1	2.1	1.3	0.8	0.62	24.0
Shipley	12.9	3.5	1.7	0.9	0.49	19.3
Spatial relations	10.1	3.7	2.4	1.2	0.65	23.7
Paper folding	6.6	2.7	1.7	1.0	0.63	24.9
Form boards	7.9	4.0	3.1	2.1	0.78	26.3
Recall	35.0	6.4	3.5	1.8	0.55	24.1
Logical memory	48.6	10.2	5.9	3.6	0.58	41.1
Paired associates	3.1	1.7	0.9	0.6	0.53	22.4
Digit symbol	78.4	21.0	5.8	3.6	0.28	9.8
Letter comparison	10.3	2.4	1.2	0.7	0.50	17.9
Pattern comparison	16.1	4.3	2.1	1.1	0.49	18.7

Note. Every participant had a mean and a standard deviation for each variable across the three sessions. The second and third columns contain the between-person means and standard deviations of the means, and the fourth and fifth columns contain the between-person means and standard deviations of the standard deviations. The sixth column is the ratio of the average within-person standard deviation (column 4) to the between-person standard deviation of the mean (column 3), and the last column expresses the average within-person standard deviation in years of cross-sectional age differences.