A 1 000-row subset of the 25 IPIP Big Five personality-marker items from
Revelle's psych package (psych::bfi). Included so that package examples
and vignettes run without reaching into psych's namespace directly.
Format
A data frame with 1 000 rows and 25 integer columns (Likert responses
scored 1–6, with some NAs reflecting genuine missing values in the
original survey). The 25 items span the Big Five personality domains:
| Columns | Domain |
A1–A5 | Agreeableness |
C1–C5 | Conscientiousness |
E1–E5 | Extraversion |
N1–N5 | Neuroticism |
O1–O5 | Openness |
Source
Revelle, W. (2026). psych: Procedures for Psychological, Psychometric, and Personality Research. Northwestern University, Evanston, Illinois. R package. https://CRAN.R-project.org/package=psych
Data collected via the SAPA (Synthetic Aperture Personality Assessment) project (https://www.sapa-project.org/). Items are public-domain IPIP (International Personality Item Pool) markers developed by Goldberg (1999):
Goldberg, L. R. (1999). A broad-bandwidth, public domain, personality inventory measuring the lower-level facets of several five-factor models. In I. Mervielde, I. Deary, F. De Fruyt, & F. Ostendorf (Eds.), Personality Psychology in Europe, Vol. 7, pp. 7–28. Tilburg University Press.
Details
Derived from psych::bfi[, 1:25] by sampling 1 000 rows with
set.seed(42). Missing values are preserved as in the original data.
The full dataset (psych::bfi) contains responses from 2 800 participants
collected via the SAPA project.
Each item column carries its public-domain IPIP stem (Goldberg, 1999) as a
label attribute, so ackwards() captures it at fit time and top_items()
prints the wording as code: label (e.g. E4: Make friends easily) with
no setup. These are plain attributes: base row-subsetting (e.g.
na.omit(bfi25), bfi25[rows, ]) drops them, as base R does for any
non-labelled-class vector, so fit on bfi25 directly – its NAs are
handled by the missing argument of ackwards() – to keep the labels.
To regenerate this dataset, run source("data-raw/bfi25.R") from the
package root.
Examples
dim(bfi25)
#> [1] 1000 25
head(bfi25)
#> A1 A2 A3 A4 A5 C1 C2 C3 C4 C5 E1 E2 E3 E4 E5 N1 N2 N3 N4 N5 O1 O2 O3 O4 O5
#> 1 6 4 4 1 6 4 2 3 3 4 2 4 3 3 1 3 2 3 6 5 5 4 4 1 2
#> 2 1 5 5 4 4 4 5 5 2 4 1 2 4 5 4 4 5 5 3 4 4 4 5 6 2
#> 3 4 5 5 3 5 5 4 4 3 2 1 1 5 6 5 2 2 4 4 2 5 2 4 5 2
#> 4 1 5 3 6 6 4 3 1 5 5 4 2 2 5 2 3 3 2 5 6 5 2 5 6 1
#> 5 2 4 4 4 3 5 5 4 2 6 5 5 3 3 3 3 3 4 5 5 3 2 3 5 3
#> 6 3 6 4 6 5 5 5 5 2 4 5 2 4 5 5 1 1 2 2 5 4 4 5 4 4
attr(bfi25$E4, "label") # public-domain IPIP item stem
#> [1] "Make friends easily"