Table 4. Goodness-of-Fit Statistics and Parameter Comparisons Between Conditions and Age-Groups.

		G2 (4) overall model fit	ΔG2 (1) for Model Parameters
	Comparison		P	M	C 1	C 2
Young:	Easy (4 colors) vs.	8.27	1.18	0.08	57.32c	54.76c
	Difficult (6 colors)	8.49
Older:	Easy (2 colors) vs.	0.61	1.52	2.46	38.99c	38.07c
	Difficult (4 colors)	3.28
Easy:	Young (4 colors) vs. Older (2 colors)		20.63c	0.44	30.51c	4.11a
Difficult:	Young (6 colors) vs. Older (4 colors)		4.68a	1.90	41.44c	7.57b
Young easy (4 colors) vs. Older difficult (4 colors)			9.84b	1.31	0.80	19.48c

Note: Values of G²(4) less than 9.49 indicate a good fit of the model to the data in the respective condition. Values of ΔG²(1) greater than 3.84 indicate a significant difference in the parameter estimates for the two groups or conditions.

^ap < .05

^bp < .01

^cp < .001.