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The Lagrange-Multiplier (LM) test, also known as the score test, is a statistical method used in econometrics to detect the presence of specific types of model misspecifications, particularly in the context of regression models. It is widely used in introductory econometric methods to test for issues such as heteroskedasticity, autocorrelation, or omitted variables without fully estimating an alternative model. The LM test operates on the principle ______ ________ ________ _______ ___ _________ ___ ____ _____ _____ _____ __________.
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