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.]

* 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.

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