Sukgumphaphan S, Pongsapukdee V. Contingency-Table Sparseness under Cumulative Logit Models for Ordinal Response Categories and Nominal Explanatory Variables with Two-Factor Interaction. Thail. Stat. [Internet]. 2015 May 28 [cited 2024 May 2];6(1):27-46. Available from: https://ph02.tci-thaijo.org/index.php/thaistat/article/view/34333