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25 personality self report items taken from the International Personality Item Pool (ipip.ori.org) were included as part of the Synthetic Aperture Personality Assessment (SAPA) web based personality assessment project. The data from 2800 subjects are included here as a demonstration set for scale construction, factor analysis, and Item Response Theory analysis. Three additional demographic variables (sex, education, and age) are also included.
data(bfi) data(bfi.dictionary)
A data frame with 2800 observations on the following 28 variables. (The q numbers are the SAPA item numbers).
A1Am indifferent to the feelings of others. (q_146)
A2Inquire about others' well-being. (q_1162)
A3Know how to comfort others. (q_1206)
A4Love children. (q_1364)
A5Make people feel at ease. (q_1419)
C1Am exacting in my work. (q_124)
C2Continue until everything is perfect. (q_530)
C3Do things according to a plan. (q_619)
C4Do things in a half-way manner. (q_626)
C5Waste my time. (q_1949)
E1Don't talk a lot. (q_712)
E2Find it difficult to approach others. (q_901)
E3Know how to captivate people. (q_1205)
E4Make friends easily. (q_1410)
E5Take charge. (q_1768)
N1Get angry easily. (q_952)
N2Get irritated easily. (q_974)
N3Have frequent mood swings. (q_1099
N4Often feel blue. (q_1479)
N5Panic easily. (q_1505)
O1Am full of ideas. (q_128)
O2Avoid difficult reading material.(q_316)
O3Carry the conversation to a higher level. (q_492)
O4Spend time reflecting on things. (q_1738)
O5Will not probe deeply into a subject. (q_1964)
genderMales = 1, Females =2
education1 = HS, 2 = finished HS, 3 = some college, 4 = college graduate 5 = graduate degree
ageage in years
The first 25 items are organized by five putative factors: Agreeableness, Conscientiousness, Extraversion, Neuroticism, and Opennness. The scoring key is created using make.keys, the scores are found using score.items.
These five factors are a useful example of using irt.fa to do Item Response Theory based latent factor analysis of the polychoric correlation matrix. The endorsement plots for each item, as well as the item information functions reveal that the items differ in their quality.
The item data were collected using a 6 point response scale: 1 Very Inaccurate 2 Moderately Inaccurate 3 Slightly Inaccurate 4 Slightly Accurate 5 Moderately Accurate 6 Very Accurate
as part of the Synthetic Apeture Personality Assessment (SAPA http://sapa-project.org) project. To see an example of the data collection technique, visit http://SAPA-project.org. The items given were sampled from the International Personality Item Pool of Lewis Goldberg using the sampling technique of SAPA. This is a sample data set taken from the much larger SAPA data bank.
The items are from the ipip (Goldberg, 1999). The data are from the SAPA project (Revelle, Wilt and Rosenthal, 2010) , collected Spring, 2010 ( http://sapa-project.org).
Goldberg, L.R. (1999) A broad-bandwidth, public domain, personality inventory measuring the lower-level facets of several five-factor models. In Mervielde, I. and Deary, I. and De Fruyt, F. and Ostendorf, F. (eds) Personality psychology in Europe. 7. Tilburg University Press. Tilburg, The Netherlands.
Revelle, W., Wilt, J., and Rosenthal, A. (2010) Personality and Cognition: The Personality-Cognition Link. In Gruszka, A. and Matthews, G. and Szymura, B. (Eds.) Handbook of Individual Differences in Cognition: Attention, Memory and Executive Control, Springer.
bi.bars to show the data by age and gender, irt.fa for item factor analysis applying the irt model.
data(bfi)
describe(bfi)
keys.list <-
list(agree=c("-A1","A2","A3","A4","A5"),conscientious=c("C1","C2","C3","-C4","-C5"),
extraversion=c("-E1","-E2","E3","E4","E5"),neuroticism=c("N1","N2","N3","N4","N5"),
openness = c("O1","-O2","O3","O4","-O5"))
keys <- make.keys(bfi,keys.list)
scores <- scoreItems(keys[1:27,],bfi[1:27]) #don't score age
scores
#show the use of the fa.lookup with a dictionary
fa.lookup(keys,bfi.dictionary[,1:4])