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In this paper linear restrictions on regression coefficients are studied. Let the p q₂ matrix of coefficients of regression of the p dependent variates on q₂ of the independent variates be B₂. Maximum likelihood estimates of an m p matrix satisfying ' B₂ = 0 and certain other conditions are found under the assumption that the rank of B₂ is p - m and the dependent variates are normally distributed (Section 2). Confidence regions for under various conditions are obtained (Section 5). The likelihood ratio test of the hypothesis that the rank of B₂ is a given number is obtained (Section 3). A test of the hypothesis that is a certain matrix is given (Section 4). These results are applied to the "q-sample problem" (Section 7) and are extended for certain econometric models (Section 6).
T. W. Anderson (1951) studied this question.