No of DF in p-value calculation from t Ratio in Parameter Estimates table (Standard least squares)
Hello, I may have a trivial question, however I have not find an answer anywhere else. I am runing a linear regression model with standard least squares (DOE made with DSD). In the Parameter Estimates table (in the attached picture) t Ratios and p-values (Prob > ItI) can be seen for each included effect in the model. I wonder what is t critical in the test or to put in another way what is the used...