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byn · ‎12-15-2013

Thank you for your article. My concern is more related to how SAS treats the data with format. After testing, I found out that continuous independent variable with two values 0 and 1 can produce the correct result. It is not necessary to use class statement to declare this variable is class variable. But if the continuous variable has more than 2 values and format statement is used to classify the values of variable, class statement must be used.

byn · ‎12-14-2013

Thank you PGStats and Reeza. I tested 10 situations. I found out that even if the continuous independent variable is formatted to two categories, proc reg without class statement still uses the original continuous values. Reeza is right.

byn · ‎12-13-2013

Programs with and without class statement use the same response variable and reference level. So, the different result is not related to the coding of response variable. I am still waiting for the answer.

byn · ‎12-13-2013

I am running proc logistic. There are one independent variable and one dependent variable. The independent variable is a numeric variable. I used format to make this variable have only 2 values, 'detect' and 'not detect'. The dependent variable only has two category, 0 and 1. I did not add the class statement for the independent variable in proc logistic procedure and SAS still gave me result. This result is different from that of adding the class statement. I want to know how SAS got the result without the class statement.

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Re: How SAS got the result without class statement in Proc Logistic

Re: How SAS got the result without class statement in Proc Logistic

Re: How SAS got the result without class statement in Proc Logistic

How SAS got the result without class statement in Proc Logistic

Re: How SAS got the result without class statement in Proc Logistic

Re: How SAS got the result without class statement in Proc Logistic

Re: How SAS got the result without class statement in Proc Logistic

How SAS got the result without class statement in Proc Logistic