https://lu.milliman.com/en-GB/insight/statistical-methods-for-imputing-race-and-ethnicity
Statistical methods for imputing race and ethnicity
Imputation is a powerful tool for studying the disproportionate impact of race and ethnicity on insurance, so we discuss some uses and limitations.
race and ethnicitystatistical methodsimputing
https://www.sandia.gov/research/publications/details/imputing-data-that-are-missing-at-high-rates-using-a-boosting-algorithm-2016-09-01/
Imputing data that are missing at high rates using a boosting algorithm – Publications – Research
using aimputingdatamissinghigh