IPIP-NEO-120 · research figures
IPIP-NEO-120: the numbers
Reliability, norms and scoring for the 120-item public-domain Big Five inventory, computed from 3,079 completed results. Every figure on this site links to the page it comes from.
Reliability
Mean domain alpha .868. Neuroticism is the most consistent domain (.903), Openness the least (.797).
Reliability tables →Norms
Percentile cut-points for all 5 domains and 30 facets, built from 3,011 results. Download them as CSV.
Norms and downloads →Scoring
Weights 0 to 4, 55 of 120 items reverse-keyed, facet totals 0–16, domain totals 0–96. No item was dropped or added to Johnson’s published set.
How scoring works →Read this first
A domain score is a percent of the maximum, not a percentile. In this sample the mean Openness score is 65.1 and the mean Neuroticism score is 45.9, so the same number means different things on different scales.