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<p>standard errors, among other techniques. When rows of data correspond to locations in space, the choice of how to model  within geographic units can have important consequences. The subfield of <a href="page.php?w=econometrics">econometrics</a> is largely focused on developing techniques that allow researchers to make reasonable real-world conclusions in real-world settings, where classical assumptions do not hold exactly.</p>

<p><big>Linear regression</big></p>
<p>In linear regression, the model specification is that the dependent variable,  is a <a href="page.php?w=linear_combination">linear combination</a></p><p>
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