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Evaluation of Imputation Techniques with Varying Percentage of Missing Data (305303)
*Seema Sangari, Kennesaw State University
Keywords: Missing Data, Missing at Random, Missing Completely at Random, Imputation, Multiple Imputation, MICE, mi, Amelia, missForest, Harrell Miscellaneous, RMSE
Missing data is a common problem which has consistently plagued statisticians and applied analytical researchers. While replacement methods like mean-based or hot deck imputation have been well researched, emerging imputation techniques enabled through improved computational resources have had limited formal assessment. This study formally considers five more recently developed imputation methods – Amelia, Mice, mi, Hmisc and missForest – compares their performances using RMSE against actual values and against the well established mean-based replacement approach. The RMSE measure was consolidated by method using a ranking approach. Our results indicate that the missForest algorithm performed best and the mi algorithm performed worst.