[R-sig-Geo] classInterval(style="fisher") vs. ArcView GIS natural breaks

[Hervé Polesi]

Hi!

Working on a litle datebase (903 lines) I notice a difference between 
the result of classInterval(style="fisher") and the natural breaks 
proposed by ArcView GIS (3.2).
I read that ArcView works on a sample of data. Is it right ? May it 
cause a significative difference ?

Greetings from Strasbourg, France.

Hervé Polesi