Characteristics of the Preliminary IPIP Scales Measuring the Big-Five Domains

Big-Five Domain	Number of Items	Mean Item Intercorrelation	Coefficient Alpha	Correlation with Markers*
	+ -
		Shorter Scales
I. Extraversion	5 + 5 = 10	.40	.87	.73 [.84]
II. Agreeableness	6 + 4 = 10	.31	.82	.54 [.66]
III. Conscientiousness	6 + 4 = 10	.29	.79	.71 [.90]
IV. Emotional Stability	2 + 8 = 10	.38	.86	.72 [.84]
V. Intellect	7 + 3 = 10	.34	.84	.67 [.80]
Total/Mean	26 + 24 = 50	.34	.84	.67 [.81]
		Longer Scales
I. Extraversion	10 + 10 = 20	.34	.91	.76 [.84]
II. Agreeableness	14 + 6 = 20	.28	.88	.57 [.65]
III. Conscientiousness	11 + 9 = 20	.27	.88	.74 [.84]
IV. Emotional Stability	5 + 15 = 20	.35	.91	.74 [.81]
V. Intellect	13 + 7 = 20	.32	.90	.69 [.77]
Total/Mean	52 + 48 = 100	.31	.90	.70 [.78]
Note.  [Values in brackets are correlations corrected for unreliability; these may be underestimates, given that the reliabilities of the factor markers were assumed to be the same as those of their corresponding IPIP scales.] Note. The numbers under the "+  -" heading indicate the number of positively and negatively items in the scale. So, for example, "5+3=8" indicates that there are 5 positively keyed items and 3 negatively keyed items, for 8 total items. * The 100 unipolar Big-Five factor markers are provided in the following article: Goldberg, L. R. (1992). The development of markers for the Big-Five factor structure. Psychological Assessment, 4, 26-42. Return to Multiple Constructs