Use the data set consump. dta for this exercise. notes: lagged variables are expressed as _1. for example, the lagged value of gy is gy_1, and the lagged value of gc is gc_1. 17 (a) estimate a simple regression model relating the growth in real per capita consumption (of nondurables and servicess to the growth in real per capita disposable income. use the change in the logarithms in both cases. report the results in