Measures comparing cumulative distributions of distance to nearest neighbor d in experiment (<i>EXP</i>), a social interaction model (<i>INT</i>) and a noninteracting control model (<i>NON</i>).

<p>By measures of the difference between median values (in <i>m</i>), the Kolmogorov-Smirnov distance , and the Kullback-Leibler divergence , the cumulative distribution of <i>INT</i> comes closer to <i>EXP</i> than <i>NON</i> does. Since is a dimensioned quantity, it is meaningful to compare values to an aphid body length, approximately 0.004 <i>m</i>. <i>EXP</i> and <i>INT</i> have median values that differ by a body length, while the other two comparison have median differences an order of magnitude larger. The three distributions are shown in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0083343#pone-0083343-g006" target="_blank">Fig. 6(A)</a>.