1. Discrete Multivariate Analysis;Bishop,1975
2. Manual of Traffic Accident Surveillance and Analysis System;Caltrans,1978
3. Causal analysis of accident involvements for the nation's large trucks and combination vehicles;Chira-Chavala;Transportation Research Record 1047,1985
4. Probability and Statistics for Engineering and the Sciences;Devore,1982
5. Analyzing Qualitative/Categorical Data;Goodman,1978