  We investigate two important questions about the use of the nonextensive
thermostatistics (NETS) formalism in the context of nonlinear galaxy clustering
in the Universe. Firstly, we define a quantitative criterion for justifying
nonextensivity at different physical scales. Then, we discuss the physics
behind the ansatz of the entropic parameter $q(r)$. Our results suggest the
approximate range where nonextensivity can be justified and, hence, give some
support to the applicability of NETS to the study of large scale structures.
