  We investigate whether true physical observables associated with the
measurements of large scale structure in the universe are frame-independent. In
particular, we study if cosmological observables such as the galaxy number
counts are invariant under the disformal transformations. In a previous work,
it was shown that this frame-invariance holds true for the case of conformal
transformations. In this work, we find that the invariance also holds true for
the case of a simple disformal transformation. We further briefly comment on
the disformal invariance of other cosmological observables.
