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<p>and <a href="page.php?w=interquartile_range">interquartile range</a> (IQR), is designed to be <a href="page.php?w=Robust_statistics">robust</a> to <a href="page.php?w=Outlier">outliers</a>. It scales features using the median and IQR as reference points instead of the mean and standard deviation:where  are the three quartiles (25th, 50th, 75th percentile) of the feature.</p>

<p><big> Unit vector normalization </big></p>
<p>Unit vector normalization regards each individual data point as a vector, and divide each by its <a href="page.php?w=Norm_%28mathematics%29">vector norm</a>,</p><p>
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