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<p>of i.i.d. binary variables (equivalently, sums of i.i.d. binary variables coded as 1 or 0) follow a <a href="page.php?w=binomial_distribution">binomial distribution</a>, but when binary variables are not i.i.d., the distribution need not be binomial.</p>

<p><big>Counting</big></p>
<p>Like categorical data, binary data can be converted to a <a href="page.php?w=Array_data_structure">vector</a> of <a href="page.php?w=count_data">count data</a> by writing one coordinate for each possible value, and counting 1 for the value that occurs, and 0 for the value</p><p>
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