. 2019 Jul 19;2(1):16. doi: 10.5334/joc.72

Table 5.

Intraclass correlations for designs with one repeated-measures factor (2 levels). The experiments of Zwaan et al. included more variables, but these did not affect the results much, so that the design could be reduced to a one-way design. The table shows the intraclass correlations, which mostly reach the desired level of ICC2 = .80 when it is calculated within conditions. The table also shows that the average reported effect size was d_z = .76. If the experiments had been based on a single observation per condition, the average effect size would have been d_z = .24, illustrating the gain that can be made by having multiple observations per participant per condition.

Study	Dependent variable	N parts	N conditions	Nobs_per_ cond	Across the entire dataset		Average within condition		d_{N = 1}	d_{N = tot}

					ICC1	ICC2	ICC1	ICC2

Camerer et al. (2018)
Aviezer et al. (2012)	Valence ratings	14	2	88	0.01	0.60	0.23	0.96	0.94	1.43
Kovacs et al. (2010)	Reaction time to visual stimuli	95	2	5	0.41	0.87	0.40	0.76	0.29	0.72
Sparrow et al. (2011)	Reaction time to visual stimuli	234	2	8 & 16	0.10	0.91	0.10	0.81	0.03	0.10
Zwaan et al. (2018)
associative priming	Reaction time to visual stimuli (Session 1)	160	2 × 2 × 2	30	0.28	0.96	0.31	0.93	0.17	0.81
	Reaction time to visual stimuli (Session 2)				0.30	0.96	0.31	0.92	0.18	0.94
false memories	Correct related-unrelated lures (Session 1)	160	2 × 2 × 2	9	0.02	0.29	0.27	0.77	0.20	0.97
	Correct related-unrelated lures (Session 2)				0.06	0.54	0.26	0.75	0.31	1.17
flanker task	RT stimulus congruent incongruent (Session 1)	160	2 × 2 × 2	32	0.40	0.98	0.41	0.96	0.15	0.70
	RT stimulus congruent incongruent (Session 2)				0.29	0.96	0.29	0.92	0.13	0.52
shape simulation	RT to shape matching sentence (Seesion 1)	160	2 × 2 × 2	15	0.42	0.93	0.42	0.91	0.08	0.27
	RT to shape matching sentence (Seesion 2)				0.49	0.97	0.50	0.94	0.17	0.50
spacing effect	Memory of massed v. spaced items (Session 1)	160	2 × 2 × 2	40	0.03	0.54	0.03	0.40	0.20	0.87
	Memory of massed v. spaced items (Session 1)				0.06	0.84	0.07	0.75	0.21	0.92