Junthopas, W. ., and C. . Wongoutong. “Comparison of Listwise Deletion and Imputation Methods for Handling a Single Missing Response Value in a Central Composite Design”. Thailand Statistician, vol. 20, no. 3, June 2022, pp. 545-61, https://ph02.tci-thaijo.org/index.php/thaistat/article/view/246984.