Key evidence & numbers
| Trait in the dependability meta-analysis | Aggregated test–retest estimate |
|---|---|
| Extraversion | 0.851 |
| Agreeableness | 0.778 |
| Conscientiousness | 0.817 |
| Neuroticism | 0.816 |
| Openness to experience | 0.810 |
The estimates are from Table 2 and concern retest intervals of up to two months across different instruments. The total sample was 14,923. They summarise rank-order consistency, not how many scale points an individual should change or a threshold separating genuine change from error on the Helibrain test. Gnambs, 2014
What is a trait, and what is a state?
A trait describes a recurring tendency; a state concerns behaviour or experience in a particular situation. Fleeson's experience-sampling studies found substantial within-person variation across everyday situations alongside stable differences in people's average patterns. Being unusually sociable one day does not require an equally large lasting shift in extraversion. Fleeson, 2001
When answering a questionnaire, the examples that come to mind can therefore matter. The dependability review discusses transient influences such as current mood and feelings, while separating that error component from internal consistency. A small retest difference does not tell us which influence was responsible. Gnambs, 2014
Is every change just noise?
No. Longitudinal research examines genuine stability and change over longer periods, with interval and age affecting the pattern. Roberts and DelVecchio's review concerns those developmental comparisons. It should not be used to dismiss every personal change or to treat two short quiz sessions as a decades-long study. Roberts et al., 2000
What affects it?
Changing questionnaires changes the measurement
TIPI, BFI-10, BFI-2 and IPIP markers use different items and scoring systems. Their broad trait labels overlap, but their numerical outputs need not be directly comparable. A score difference between sites can therefore reflect different measurement rather than a sudden change in personality. Gosling et al., 2003 Rammstedt et al., 2007 Soto et al., 2017 International Personality Item Pool, 2026
Shorter instruments also sacrifice some precision and coverage. The BFI-2 short-form paper discusses when its 30- and 15-item forms are appropriate and warns against fine-grained facet interpretation from the shortest form. Small differences deserve particular caution when little information supports each score. Soto et al., 2017
What does a 0–100 score mean?
For the related IPIP-based task, the display rescales your answers between their minimum and maximum. It is not a population percentile or a percentage of personality possessed. The same raw-scale position can have a different population standing under a different questionnaire or norm group. International Personality Item Pool, 2026 International Test Commission, 2001
How can you make comparisons more interpretable?
Use the same questionnaire, language, instructions and scoring, and answer about the intended recurring patterns rather than trying to reproduce last time's result. Keep the testing context in mind. These are interpretation practices, not a validated technique for making a personality score stay fixed. International Test Commission, 2001 Gnambs, 2014
If a change appears important, consider whether it persists across time and situations instead of assigning it a cause from one retest. The cited research does not provide a universal number of points that counts as real change for this online implementation. A consequential interpretation would need the specific instrument's measurement evidence. Gnambs, 2014 International Test Commission, 2001
The realistic conclusion is that personality measures can contain both stable signal and variation. Neither perfect sameness nor constant fluctuation should be assumed in advance. Fleeson, 2001 Roberts et al., 2000
Try the related free test
Big Five personality test
Try the Big Five test as a structured self-description. If you revisit it, compare the same 50-item instrument and remember the context. A score shift is not a clinical finding or proof that your personality fundamentally changed.
Common questions
Should I expect exactly the same result?
No. Short-term dependability is substantial but imperfect, and it differs by instrument and trait. Gnambs, 2014
Can I compare scores from two sites?
Only if their instruments, scoring and reference systems support that comparison. Similar trait names alone are insufficient. International Test Commission, 2001
Does one mood explain a new result?
It can contribute, but one score difference does not identify its cause. Transient influences and longer-term patterns need to be distinguished. Gnambs, 2014 Fleeson, 2001
Sources
- Gosling et al. (2003). A very brief measure of the Big-Five personality domains.
- Rammstedt et al. (2007). Measuring personality in one minute or less: A 10-item short version of the Big Five Inventory in English and German.
- Soto et al. (2017). The next Big Five Inventory (BFI-2): Developing and assessing a hierarchical model with 15 facets to enhance bandwidth, fidelity, and predictive power..
- Soto et al. (2017). Short and extra-short forms of the Big Five Inventory–2: The BFI-2-S and BFI-2-XS.
- Gnambs (2014). A meta-analysis of dependability coefficients (test–retest reliabilities) for measures of the Big Five.
- Fleeson (2001). Toward a structure- and process-integrated view of personality: Traits as density distributions of states..
- Roberts et al. (2000). The rank-order consistency of personality traits from childhood to old age: A quantitative review of longitudinal studies..
- International Test Commission (2001). International Guidelines for Test Use.
- International Personality Item Pool (2026). 50-item IPIP Big-Five factor markers: scoring keys and reliabilities.
Explore your daily routines in Helibrain
The app has short tests of reaction time, working memory, self-control, reasoning and creativity. Retake them whenever you like, see your trend, and find habits that may help.
Start free in your browser
