Missing data may be a concern for data analysis. If it has a hierarchical or nested structure, the SUDAAN package can be used for multiple imputation. This is illustrated with birth certificate data that was linked to the Centers for Disease Control and Prevention’s National Assisted Reproductive Technology Surveillance System database. The Cox-Iannacchione weighted sequential hot deck method was used to conduct multiple imputation for missing/unknown values of covariates in a logistic model.
Zhang, Y., Crawford, S., Boulet, S., Monsour, M., Cohen, B., McKane, P., & Freeman, K. (2017). Using multiple imputation to address missing values of hierarchical data. Journal of Modern Applied Statistical Methods, 16(1), 744-752. doi: 10.22237/jmasm/1493599140