Question: Let X=x1xN, where each xi denotes a data point. Which of the following conditions are sufficient to guarantee that the optimal parameters of OLS are

Let X=x1xN, where each xi denotes a data point. Which of

Let X=x1xN, where each xi denotes a data point. Which of the following conditions are sufficient to guarantee that the optimal parameters of OLS are unique? (Select all that are correct) X is full rank XX is full rank X is a square matrix XX is positive semi-definite XX is positive definite

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