A Comparison between the 5 Broad Domains in Costa and McCrae's
NEO Personality Inventory (NEO-PI-R) and the
Corresponding Preliminary IPIP Scales Measuring Similar Constructs
 
10-Item IPIP Scales
Number
of Items
Mean Item
Intercorrelation
Coefficient
Alpha
Correlation
with NEO-PI-R
I. Neuroticism
5+5=10
.37
.86
.82 [.92]
II. Extraversion
5+5=10
.38
.86
.77 [.88]
III. Openness
5+5=10
.33
.82
.79 [.91]
IV. Agreeableness
5+5=10
.27
.77
.70 [.85]
V. Conscientiousness
5+5=10
.31
.81
.79 [.92]
Mean
5+5=10
.33
.82
.77 [.90]
20-Item IPIP Scales
I. Neuroticism
10+10=20
.33
.91
.86 [.93]
II. Extraversion
10+10=20
.35
.91
.79 [.88]
III. Openness
10+10=20
.29
.89
.83 [.92]
IV. Agreeableness
10+10=20
.23
.85
.78 [.90]
V. Conscientiousness
10+10=20
.31
.90
.80 [.88]
Mean
10+10=20
.30
.89
.81 [.90]
         
         
Note.  [Values in brackets are correlations corrected for unreliability.]


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