Although single ratio imputation is often used to deal with missing values in practice, there is a paucity of discussion regarding multiple ratio imputation. Code in the R statistical environment is presented to execute multiple ratio imputation by the Expectation-Maximization with Bootstrapping (EMB) algorithm.
Takahashi, M. (2017). JMASM44: Implementing multiple ratio imputation by the EMB algorithm (R). Journal of Modern Applied Statistical Methods, 16(1), 657-673. doi: 10.22237/jmasm/1493598900