युगपत समीकरण मॉडलों में, साधारण न्यूनतम वर्ग (OLS) को बिना किसी पक्षपात के सीधे लागू किया जा सकता है यदि:

In a multiple linear regression model with two independent variables (X1 and X2), if X1 and X2 are perfectly correlated (r = 1), this will lead to:

In the semi-log model ln(Yt) = β1 + β2t + Ut, parameter β2 represents the:

For identification in a simultaneous equation model, the rank condition is: