Methodology

Big Five Personality Traits

The Big Five (OCEAN model) is the most widely accepted personality trait model in modern psychology. Decades of factor analysis research have repeatedly confirmed that human personality can be described along five independent dimensions.

The Malouff et al. meta-analysis (integrating 19 samples covering 3,848 participants) reports associations between Big Five personality traits and relationship satisfaction. Our analysis draws on insights from research such as this.

• Agreeableness - A trait reflected in warmth, consideration, and how one relates to others
• Emotional Stability - Relates to calmness and how one copes with stress
• Conscientiousness - Reflected in planning, self-discipline, and everyday habits
• Extraversion - Reflected in sociability and one's style of engaging with people
• Openness - Relates to intellectual curiosity and interest in new experiences

Age Gap Statistics

Multiple large-scale statistical studies exist on the relationship between age gaps and relationship longevity. Emory University research (3,000 participants) and Japan's Ministry of Health, Labour and Welfare vital statistics report statistical trends in how age gaps relate to relationships.

However, age gap statistics represent population-level trends and do not predict outcomes for individual couples. Many couples with significant age differences maintain happy, lasting relationships.

Zodiac (Element Compatibility)

Western astrology has a long tradition of grouping the twelve zodiac signs into four elements (Fire, Earth, Air, Water) and describing compatibility through their combinations. On this site, this is treated as a cultural reference item; scientific evidence is limited, so please enjoy it as a fun extra.

Blood Type (Reference)

Large-scale surveys (10,000+ participants) have found no statistically significant relationship between blood type and personality. On this site, blood type is treated as a reference item rooted in Japanese cultural tradition, so please enjoy it as a fun extra. Blood type input is optional and excluded from evaluation if not provided.

Overall Assessment

Your results present compatibility assessed holistically from multiple perspectives, including personality traits, expressed as a rank from SSS to G.

When optional items are left blank, evaluation is performed using only the provided inputs. The analysis can be completed with Big Five responses alone.

References

• Malouff, J. M., Thorsteinsson, E. B., Schutte, N. S., Bhullar, N., & Rooke, S. E. The Five-Factor Model of personality and relationship satisfaction of intimate partners: A meta-analysis. Journal of Research in Personality, 44(1), 124-127.
• Nawata, K. No relationship between blood type and personality: Evidence from large-scale surveys in Japan and the US. Japanese Journal of Psychology, 85(2), 148-156.
• Ministry of Health, Labour and Welfare, Japan - Vital Statistics