Hello, I have a question regarding the model statement syntax in proc logistic. I read that the below two model statements are equivalent. 1. Mode1 Purchase * Gender Age Region; 2. Mode1 Purchase * Gender|Age|Region @1; I have never seen such model statements ever before. My questions are 1. Can we use asterisk to separate the dependent from independent variables? 2. What is the @1 doing in the 2nd option above? 3. How are these two statements equivalent? ... View more