RMA regressions of ulna length against width.

<p>A–B, ulna length against anteroposterior width; C–D, ulna length against mediolateral width. A, C, regression lines of Stegosauria, Ankylosauria, Hadrosauridae, Ceratopsidae and basal bipedal ornithischians; B, D regression lines of Thyreophora, Ornithopoda and Marginocephalia. Regression lines for groups in which there was no statistically significant correlation between X and Y at the p = 0.05 level are not shown. Abbreviations: <b>UAPW</b>, ulna anteroposterior width; <b>UL</b>, ulna length; <b>UMLW</b>, ulna mediolateral width.