A Comparison between the 5 Broad Domains in Costa and McCrae's NEO Personality Inventory (NEO-PI-R) and the Corresponding IPIP-NEO-60 Scales

 

12-Item IPIP-NEO-60 Scales

Number
of Items

Mean Item
Intercorrelation

Coefficient
Alpha

Correlation
with NEO-PI-R

         +   -

I. Neuroticism

4+8=12

.22

.95

.84 [.89]

II. Extraversion

11+1=12

.16

.92

.77 [.85]

III. Openness

6+6=12

.17

.92

.78 [.85]

IV. Agreeableness

6+6=12

.13

.90

.71 [.79]

V. Conscientiousness

7+5=12

.23

.92

.69 [.75]

 

 

 

 

 

Mean

7+5=10

.33

.92

.76 [.83]

 

 

 

 

 

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. Reliability and validity estimates are based on the Eugene-Springfield community sample of N = 757. This is Sample 2 in Maples-Keller, et al. (2019). [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, "4+8=12" indicates that there are 4 positively keyed items and 8 negatively keyed items, for 12 total items.

 

Reference

 

Maples-Keller, J. L, Williamson, R. L., Sleep, C. E., Carter, N. T., Campbell, W. K., & Miller, J. D. (2019). Using item response theory to develop a 60-item representation of the NEO PI–R using the International Personality Item Pool: Development of the IPIP–NEO–60. Journal of Personality Assessment, 101, 4-15. DOI: 10.1080/00223891.2017.1381968

 

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