[Gretl-users] monthly price index

Dear All, I have a problem. I want to construct a monthly price index. Orginal question is: "Convert the coefficients of the monthly dummy variables you use for your index construction into large percentage change format with the transformation exp(b)-1 Provide a table with summary statistics on all variables in your regression other than neighborhood dummies." I created and describe the dummies. I could not find the next steps. How can construct a montly price index? Best,