  In this paper we present formulae for chord length distribution in the
framework of Poissonian Voronoi Tessellation (PVT) and non Poissonian Voronoi
Tessellation (NPVT). The introduction of the scale parameter in the obtained
distributions allows us to model the chord for cosmic voids. A graphical
comparison between cosmic voids visible on two catalogs of galaxies, 2dFGRS and
VIPERS, and theoretical random chords is reported.
