Hi all, In the CMP they combine \gamma_1 and \gamma_1.\alpha_1 into \gamma_i how comes they dont combine \gamma_1.\beta_j with this, but instead introduce a new parameter \sigma_j? Thanks
Hi Molly Hope this is the right question! the j is for motor insurance group, gamma_1*beta_j is a separate term which has been renamed/simplified to delta_j if you tried to combine the i's and j's that would imply interaction Hope this helps Thanks Andrea
ah that makes sense, so i could have combined gamma_1 with gamma_1.\beta_j instead of combining it with gamma_1.\alpha_i, but i cannot combine anything with lettered subscripts as this would mean interaction as you said?
