%0 Journal Article %T Constructing Locally Best Invariant Tests of the Linear Regression Model Using the Density Function of a Maximal Invariant %J American Journal of Mathematics and Statistics %@ 2162-8475 %D 2013 %I %R 10.5923/j.ajms.20130301.07 %X In the context of the linear regression model in which some 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 argument. This allows the construction of a range of optimal test statistics including the locally best invariant (LBI) test which is equivalent to the well-known one-sided t-test. The resultant LBI test is also found to be uniformly most powerful invariant (UMPI). %K Invariance %K Maximal Invariant Statistic %K Nuisance Parameters %K t-Test %K Uniformly Most Powerful Invariant (UMPI) %U http://article.sapub.org/10.5923.j.ajms.20130301.07.html