Abstract
In the context of the linear regression model in which som e regression coefficients are of interest and others are purely nuisance parameters, we derive the density function of a maximal invariant statistic after eliminating the nuisance parameters by the principle of invariance argu ment. This allows the construction of a range of optimal test statistics including the locally best invariant (LBI) test wh ich is equivalent to the well-known one-sided t-test. The resultant LBI test is also found to be uniformly most powerfu l invariant (UMPI).
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