Niwitpong, S.- aat and Panchatree, N. (2015) “Confidence Intervals for the Response Mean of a Simple Regression Model Following Pretests”, Thailand Statistician, 9(1), pp. 21–35. available at: https://ph02.tci-thaijo.org/index.php/thaistat/article/view/34282 (accessed: 29 September 2026).