<p><b>Competency:</b> definition to be added</p>
<p><b>Domain:</b> definition to be added</p>
<p><b>Importance:</b> definition to be added</p>
<p><b>Performance:</b> definition to be added</p>
<p><b>Z-Score:</b> The z-score is a statistical measure that looks at not just the size of the difference between scores, but how meaningful that difference is. It converts raw scores to a number that more reliably indicates the importance of the difference between an individual's scores and the overall average of the group.</p>
<p>Large positive numbers indicate higher performance and large negative numbers indicate lower performance, relative to the rest of the group.  The closer a z-score is to zero, the more likely that that individual's performance is similar to the overall average of the group.</p>
<p>A z-score of -1 to +1 encompasses about 67% of the population.  See the distribution below for more information.</p>
<p align="center"><img alt="z_score" align="center" src="/~greenwells/graphics/z_score.png" /></p>