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<title>Similarity web interface instructions</title>
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<h1>Similarity web interface instructions</h1>
<p>Enter the terms or Concept Unique Identifiers (CUIs) whose similarity or
relatedness you wish to compute into the fields labeled <em>Term 1</em> and
<em>Term 2</em>. You can enter any combination of terms or CUIs. For example:
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<ol>
<li>heart attack and skull</li>
<li>C0018563 and C0037303</li>
<li>hand and C0037303</li>
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<p>
You can than either calculate the two terms similarity or relatedness. Semantic
similarity measures quantify how ``alike'' (or similar) two concepts are by
determining their closeness in a hierarchy. Semantic relatedness measures quantify
the degree of semantic feature overlap between two terms. Two terms may be related
(needle-thread) but not necessarily similar.
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<p>
To calculate the similarity you have two options:
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<li>SAB which designates what UMLS source to obtain the hierarchical
information</li>
<li>REL which designates what relation information to use from the
designated source</li>
</ol>
</p>
<p> To calculate hte relatedness you also have two options:
<ol>
<li>SABDEF which designates what UMLS sources to obtain the definitions from</li>
<li>RELDEF which designates what relations to use to create the extended
definiton</li>
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