<p class="p1">In discussion about search keys, concern has been <span class="s1">expressed </span>as to how the nunber of items tetrieved by a <span class="s1">single </span>value relates to <span class="s1">collection size. </span>This paper <span class="s1">creates </span>a <span class="s1">statistical </span>model that attempts to give <span class="s1">some </span>insight into this behavior. It <span class="s1">is concluded </span>that, in general, the observed behavior <span class="s1">can

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... /span>be <span class="s1">explained </span>as being intrinsically <span class="s1">statistical in </span>nature <span class="s1">rather </span>than being a property <span class="s1">of specific search </span>keys. <span class="s1">An </span>attempt <span class="s1">is </span>made to relate this model to other tesearch, and to indicate how this model may be made to yield more accurate predictions.</p>