请教各位：怎么用STATA回归这个方程，估计参数呢?
Wi=αi+∑j γijlog Pj+βi log(X/P)
；i =1, ….10
where
wi=
the proportion of consumption expenditure on commodity i to total consumption.

P j
= price index for commodity j

X
= total consumption expenditure

P
= price index where log P = wk log Pk.