The Invariance of Some Score Tests in the Linear Model With Classical Measurement Error
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The linear model with classical measurement error is an alternative to the standard regression model, in which it is assumed that the independent variables are subject to error. This assumption can cause statistical inferences and parameter estimators to differ dramatically from those obtained by the standard regression model. However, in some cases, inferences remain unchanged even though the independent variables are assumed to be subject to error. This article investigates the invariance property of score tests for assessing heteroscedasticity, first-order autoregressive disturbance, and the need for a Box–Cox power transformation. Under specific constraints, we show that the score tests for measurement error models are identical to the corresponding well-established tests derived from standard regression models. Hence practitioners can assess assumptions of constant variance and independent errors, as well as the need for a Box–Cox transformation, irrespective of whether or not the variables are measured with error. We also discuss some possible generalizations.
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