  Naive dimensional analysis (NDA) is a widely used ansatz to estimate coupling
constants among composite states emerging from dynamics of a strongly coupled
gauge theory. However, the validity of NDA is still unclear because of the
difficulty in calculating these quantities in strongly coupled theories. We
examine the NDA ansatz using gauge/string duality, by estimating glueball
coupling constants from gravitational description. The NDA scaling rule for
coupling constants of some types of glueballs is verified and extended by both
generic estimation and numerical calculations. The scaling rule verified in
this article can be applied to some class of quiver gauge theories as well, not
just to gauge theories with a single gauge group $SU(N_c)$.
