Use this sociology calculation to reproduce a named demographic, inequality, mobility, urban, or survey measure when the population, period, categories, and coding rules are explicit.

Incomes

Required list. Income values in the distribution.

The cited overview of Sociology supplies background for the terminology and domain context used by this tool.^[1]

Compute the Robin Hood (Pietra) inequality index as the total absolute deviation of incomes from the mean divided by twice the aggregate income. Inputs are interpreted exactly in the displayed units and the calculation returns the following fields without presentation rounding.

Robin Hood index

Returned number. Share of total income that would need to move to reach perfect equality.

• Definitions, sampling error, missing data, historical context, geographic boundaries, weighting, and classification choices can materially change social indicators and their interpretation.
• Use finite inputs in the displayed units, preserve source measurements and assumptions, and independently verify consequential decisions.

Report the source population and uncertainty, inspect disaggregated data, and compare multiple accepted indicators rather than treating one summary statistic as a complete social explanation.

• Schutz Index Calculator

  Compute the Schutz inequality index as the below-mean income shortfall divided by total income.

• Top 10% Income Share Calculator

  Compute the share of total income held by the richest decile or any chosen top fraction of a sample.

• Stouffer Intervening Opportunities Access Ratio Calculator

  Compute an access-ratio heuristic as opportunities at a destination divided by opportunities encountered before it; this is not the cumulative Stouffer formulation for migration probability.