Twin2K is a multi-wave U.S. survey of 2,058 adults measuring personality, cognition, wellbeing, and economic decision-making. The dataset used here is a flattened version of the raw parquet files, extracted and merged in Python to produce a single row per respondent across all waves.
The sample skews slightly toward the South and full-time employed, and is roughly split by gender. Politically, Democrats and Independents outnumber Republicans, with most respondents falling somewhere in the moderate-to-liberal range on ideology.
A few things worth highlighting from the data:
Personality
Agreeableness is the highest-rated Big Five trait across the board (mean 3.90 / 5.0). Females score higher on both agreeableness and neuroticism; Democrats score higher on openness; Republicans score higher on conscientiousness.
Cognition
Financial literacy and crystallized intelligence rise consistently with education and income. Fluid intelligence shows a much flatter gradient — the distinction between learned and native cognitive ability holds up clearly in the data.
Wellbeing
The 18–29 cohort reports the highest anxiety and depression scores of any age group. Lower income is strongly associated with worse wellbeing outcomes. Among political ideologies, those identifying as Very Liberal report the highest anxiety and depression scores.
Behavioral Economics
Overconfidence is positive across every single demographic slice — nobody is exempt. Older respondents show modestly lower overconfidence and higher risk aversion.
Explore the Data
The interactive dashboard below covers all five dimensions of the dataset: demographics, personality, cognition, wellbeing, and behavioral economics. Hover any chart for details and use the dropdowns to cut by gender, age, or political group.
Interactive Open the Twin2K Dashboard →For the full analysis, see the Twin2K write-up.