# Likert scale questionnaire and logistic regression

I have three independent variables , and one moderating variable. I'm studying the affect of these variables on the decision to adopt electronic commerce.

I have a questionnaire, based on this questionnaire which is on a 7-point likert scale (from totally disagree which is coded 1 to totally agree which is coded 7).

I have gathered data on on my three independent variables. Now I want to analyze the model.

Question is should I calculate mean for every IVs and then do the logistic regression?

• What's your question? (The last line appears to be a little garbled.) – whuber Aug 1 '11 at 18:49

There is no need to do recentering. The linear part of the GLM can simply include an intercept term (e.g. b0 + b1*x1 + b2*x2 + b3*x3), and this will be estimated by standard statistical software.