Hi, I am using the quaids command to estimate an AIDS for different meats. I am interested in how consumption changes for different income groups. So ideally I would like to obtain different income elas for different income groups. The left-hand side variable of the system, expenditure, will in my example not be an adequate measure, because this will be total meat expenditure which is only weakly correlated with income. Therefore, I was wondering if I include income or income dummies in the demographics whether it would be possible to use the etas as income elasticities? What exactly do they signify?