Table A4
Percentiles affected by errors in the estimation of income thresholds and interfractile average incomes at the county level, 2010–2015
| Income thresholds | Interfractile average incomes | ||
|---|---|---|---|
| Errors | Number | Errors | Number |
| P90 > P95 | 472 | P90–95 > P95 | 2,706 |
| P95 > P99 | 5 | P95–99 > P99 | 83 |
| P99 > P99.5 | 0 | P99–99.5 > P99.5 | 0 |
| P99.5 > P99.9 | 0 | P99.5–99.9 > P99.9 | 0 |
| P99.9 > P99.99 | 0 | P99.9–99.99 > P99.99 | 0 |
| Total | 477 | Total | 2,789 |
Source: Authors’ analysis of state-level tax data from Sommeiller 2006 extended to 2015 using state-level data from the Internal Revenue Service SOI Tax Stats (various years) and Piketty and Saez 2016
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