Designing and evaluating tasks to measure individual differences in experimental psychology: a tutorial

Cognitive Research: Principles and Implications

Table 1 Item analysis of the 24 stimuli used in the study leading to the scree plot of Fig. 3

Item	Mean	SD	Item_rest	Factor_loading
item_1	0.92	0.27	0.50	0.78
item_2	0.93	0.26	0.60	0.89
item_3	0.91	0.29	0.53	0.81
item_4	0.94	0.24	0.58	0.92
item_5	0.87	0.34	0.57	0.80
item_6	0.77	0.42	0.43	0.62
item_7	0.92	0.28	0.62	0.92
item_8	0.88	0.33	0.60	0.85
item_9	0.57	0.50	0.40	0.58
item_10	0.83	0.38	0.55	0.74
item_11	0.77	0.43	0.46	0.61
item_12	0.66	0.48	0.47	0.65
item_13	0.49	0.50	0.42	0.61
item_14	0.72	0.45	0.43	0.59
item_15	0.62	0.49	0.55	0.73
item_16	0.85	0.36	0.58	0.80
item_17	0.74	0.44	0.47	0.63
item_18	0.66	0.47	0.52	0.68
item_19	0.78	0.41	0.59	0.79
item_20	0.34	0.48	0.35	0.53
item_21	0.71	0.45	0.57	0.75
item_22	0.71	0.45	0.52	0.69
item_23	0.49	0.50	0.48	0.64
item_24	0.03	0.17	0.05	0.06

All items are good (high item-rest correlations, high factor loadings), except for the last one