In the context of Pediatrics, Missing at Random (MAR) is a term used in statistical analysis to describe a pattern of missing data. Specifically, data are considered MAR if the probability of missingness is related to observed data but not to the unobserved data. For instance, in a pediatric study, if the likelihood of missing height measurements depends on the child's age or sex, but not on their actual height, then the data could be considered MAR.
