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]

 

 

 

 

 
48-Item NEO PI-R Scales
I. Neuroticism 27+21=48 .22 .93
II. Extraversion 29+19=48 .15 .89
III. Openness 24+24=48 .17 .91
IV. Agreeableness 26+22=48 .14 .89
V. Conscientiousness 28+20=48 .19 .91
         
Mean 27+21=48 .17 .91
 

Note.  [Values in brackets are correlations corrected for unreliability.]

 

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.

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