RDP 2018-08: Econometric Perspectives on Economic Measurement Equation (14)

= {\hat{P}}_{i, j}^{G o l d b e r g e r} \equiv exp ({\hat{α}}_{j} - {\hat{α}}_{i} - 0.5 V \hat{a} r ({\hat{α}}_{j} - {\hat{α}}_{i}))