Scientific Credibility
Reliability and relevance of Team Navigator’s personality scales
The personality questionnaire used in our application is based on the globally recognized IPIP (International Personality Item Pool) database of personality test questions. The study mentioned below demonstrates the very good reliability and relevance of the psychometric tool used by Team Navigator:
Maples, J. L., Guan, L., Carter, N. T., & Miller, J. D. (2014). A test of the International Personality Item Pool representation of the revised NEO Personality Inventory and development of a 120-item IPIP-based measure of the Five-Factor Model. Psychological Assessment, 26, 1070-1084.
Reliability
It is a statistical measure that pertains to the precision of measuring personality traits. A reliable questionnaire provides us with accurate and repeatable results. The reliability of our questionnaire can be determined as high by measuring Cronbach’s alpha. It is based on internal consistency, indicating the degree to which individual variables are related to a single concept. It is estimated after a single administration of the given test. It is most commonly used in psychological research to measure personality variables or human attitudes. It takes values in the range of 0-1, with the closer the results are to 1, the higher the reliability of the scale. In psychometric studies, it is assumed that results above 0.7 indicate satisfactory scale reliability. Detailed estimates of Cronbach’s alpha reliability are available for all scales in the table below.
Relevance
It indicates how well the questionnaire measures what we want to measure with the questionnaire. In the case of our application, we can ask ourselves – is it really a personality questionnaire? Thanks to high relevance, we also know whether the conclusions we draw based on the results are correct. The higher the relevance, the better the tool. Since many IPIP scales have been designed to measure constructs similar to those in existing personality inventories, the primary form of validity verification is the correlation between the IPIP scale and the scale on which it was based – the benchmark NEO-PI-R personality test. These correlations are high, so we can determine very good tool relevance. Detailed data can be found in the comparative tables, which you will find in the table below.
| Scale name | Number of questions (+−) | Average correlation between questions | Cronbach’s alpha | Correlation with NEO-PI-R |
|---|---|---|---|---|
| Neuroticism | 16+8=24 | 0.24 | 0.88 | 0.87 [0.96] |
| Extraversion | 21+3=24 | 0.19 | 0.85 | 0.85 [0.98] |
| Openness to experience | 7+12=24 | 0.20 | 0.85 | 0.84 [0.96] |
| Agreeableness | 5+19=24 | 0.14 | 0.79 | 0.78 [0.93] |
| Conscientiousness | 12+13=24 | 0.18 | 0.84 | 0.78 [0.89] |