Use relevel Function to re-level the Price factor with value 30 as the base reference. In the original model that we fitted with the function call: mylogit =- glm(MYDEPV - Income + Age + as. factor (Price) + data= Mydata, family=binomial(link="logit"), + na . action=na. pass) we obtained the results shown below: coefficients: Estimate Std. Error z value Pr (> |z|) (Intercept ) - 6.02116 0 . 53244 -11.309 = 2e-16 Income 0. 12876 0. 00923 13.950 = 2e-16 Age 0. 03506 0 . 01179 2.974 0.00294 as . factor (Price)20 -0.74418 0.26439 - 2. 815 0. 00488 * * as . factor (Price)30 -2.21028 0 . 31108 -7. 105 1.2e-12 What does this tell us