Merge whchang's typo fix to HEAD.
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@@ -19,7 +19,7 @@ this parameter coincides with the percentage of users that answer the question c
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<h2>Standard Deviation (SD)</h2>
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<p>This parameter measures the spread of answers in the response population. If all users
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answers the same, then SD=0. SD is calculated as the statistical stadard deviation for the
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answers the same, then SD=0. SD is calculated as the statistical standard deviation for the
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sample of fractional scores (achieved/maximum) at each particular question.</p>
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<h2>Discrimination Index (DI)</h2>
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