Comment on "Quantum and Classical Glass Transitions in LiHo${}_x$Y${}_{1-x}$F${}_4$" by C. Ancona-Torres, D.M. Silevitch, G. Aeppli, and T. F. Rosenbaum, Phys. Rev. Lett. 101, 057201 (2008)

We show in this comment that the claim by Ancona-Torres et al. of an equilibrium quantum or classical phase transition in the LiHo${}_x$Y${}_{1-x}$F${}_4$ system is not supported by a rigorous scaling analysis.