  We improve Haldane's formula which gives the number of configurations for $N$
particles on $d$ states in a fractional statistic defined by the coupling
$g=l/m$. Although nothing is changed in the thermodynamic limit, the new
formula makes sense for finite $N=pm+r$ with $p$ integer and $0<r\leq m.$ A
geometrical interpretation of fractional statistic is given in terms of
''composite particles''.
