Table 9.

Study 3: Reliability of Scores of Single-Item Measures.

Scale	Full (N = 411)			Panel (N = 276)			Correlations at T1 a
	$r_{xx}$	LB	UB	$r_{xx}$	LB	UB	1	2	3
1 SI Direct	.71	.65	.76	.74	.66	.77		.79	.82
2 SI Indirect	.82	.77	.85	.85	.81	.88	.80		.72
3 ${\mathrm{SI}\mathrm{Direct}}_{frequency}$	.77	.71	.81	.80	.74	.84	.81	.74

Note. $r_{xx}$ = reliability as estimated by Formula 9 presented in Heise1969; LB = lower bound of the 95% confidence interval of the estimated reliability; UB = upper bound of the 95% confidence interval of the estimated reliability; SI = single item.

^aCorrelations in the Full Sample are displayed below the diagonal, and correlations in the Panel Sample are displayed above the diagonal.