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. Individual incomes in the sample.

Top fraction

Optional number. Top fraction of earners whose share is measured; one tenth gives the classic top ten percent.

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

Compute the share of total income held by the richest decile or any chosen top fraction of a sample. Inputs are interpreted exactly in the displayed units and the calculation returns the following fields without presentation rounding.

Top share (%)

Returned number in %. Percentage of all income held by the top group.

• Definitions, sampling error, missing data, historical context, geographic boundaries, weighting, and classification choices can materially change social indicators and their interpretation.
• Top fraction must be at least 0.
• Top fraction must be no greater than 0.9999999999999999.
• 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.

• Robin Hood (Pietra) Index Calculator

  Compute the Robin Hood (Pietra) inequality index as the total absolute deviation of incomes from the mean divided by twice the aggregate income.

• Schutz Index Calculator

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

• Postponement Proportion Index Calculator

  Measure the share of births born to mothers at or above a chosen postponement reference age.