We compare predictions of weak-current models for ${\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ production initiated by $\ensuremath{\nu}$ and $\overline{\ensuremath{\nu}}$ with experimental $x$, $y$, $p$, and $v$ distributions of the muon associated with the incident neutrino. These distributions indicate that $\ensuremath{\nu}N$ dimuon production occurs dominantly off valence quarks, with a $y$ dependence that is somewhat suggestive of ${(1\ensuremath{-}y)}^{2}$, while $\overline{\ensuremath{\nu}}N$ production occurs from sea quarks. Nevertheless, the original charm model provides a viable explanation within the uncertainties of present data. An improved description of the $\ensuremath{\nu}N$ dimuon distributions is obtained with a $V+A$ charm-changing current. The dimuon data do not exhibit the characteristics expected from the production of the $b$-type quark of vectorlike theories. A vector-meson-dominance interpretation does not predict satisfactory $x$ dependences.