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<p>relationship between the dependent variable y and the vector of regressors <b>x</b> is <a href="page.php?w=linear_function">linear</a>. This relationship is modeled through a disturbance term or error variable ?--an unobserved <a href="page.php?w=random_variable">random variable</a> that adds extra "noise" to the linear relationship between the dependent variable and regressors. Thus the model takes its formwhere <sup>T</sup> denotes the <a href="page.php?w=transpose">transpose</a>, so that <b>x</b><sub>i</sub><sup>T</sup><b><i>?</i></b> is the</p><p>
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