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Thanks! Gareth, I have a data like this: year y_firmA y_firmB ... y_firmL x_firmA x_firmB ... x_firmL ER GDP 1901 15,000 20,000 15,000 0,205 0,255 0,245 2.53 102.3 1902 25,000 30,000 20,000 0,221 0,231 0,215 2.12 104.5 . . . . . . . . . . . . . . . . . . . . . . . . . . . 2000 95,000 80,000 90,000 0...

Hi Gareth, help please I have a problem with this estimation: yit= b1*Xit + b2*Zt where: yit: is a vector of nT rows (n firms and T periods) corresponding to the loans of firm i in period t. Xit: is a vector of nT rows corresponding to the interes rate of firm i in period t. Zt: nTxK1 is a matrix co...