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  1. R

    Market Mix Models : Confidence in Coefficients

    In market mix models, my sales(y) depends on 4 promotions(p1--p4). Let (b11, b21, b31, b41 ) be the coefficients of p1--p4 in one iteration and (b12, b22, b32, b42 ) be the coefficients in the second iteration. I check the validity of the model based on some general guidelines:(i)b1--b4 should...
  2. R

    Variable selection in Logistic Regression

    Hello all, I have a query regarding attrition analysis using logistic regression. Say that I calculate the length of stay of an employee in an organization (say 'Tenure') and divide tenure in to 10 buckets . Every employee falls in to any one of these buckets(1 to 10). Say percentage attrition...
  3. R

    Issue defining ordinal variables in SAS

    Hello All, I am developing a Logistic Regression model in SAS and I have one of the independent variables as Age. I do not have exact age but I have the age buckets. Say 26 Years-30 years as bucket 1, 31 years to 35 years as bucket 2, 36 years to 40 years as bucket 3, and so on. If I include...
  4. R

    Conceptual queries in modeling

    Hi all, I am from engineering background. I would require your help in certain conceptual questions in modeling. Your help would be greatly appreciated! Following are my few questions... (Pointers on these questions would help me , else you may direct me to any useful resources.) 1)If a...