... Imputation Methods to Deal with Missing Values when Data Mining Trauma Injury Data Kay I Penny Centre for Mathematics and Statistics, ... value. Keywords Data mining, missing data imputation, trauma injury. 1. Introduction Trauma injury is the most common cause of loss of life to those under forty [1]. In 1991 a trauma system ... complete data set, and the model is then tested on the same set of data used to build it. However, it is not ideal to test the model with the same data used to build it, and to allow comparison with...