Message-ID: <Pine.GSO.4.21.0212161129490.27372-100000@austin>
Date: 2002-12-16T12:39:02Z
From: Dr Andrew Wilson
Subject: Partial Sums
Is it possible to calculate partial sums in R?
I have the equation:
Px = (k / x) * SUM_{from j >= x to infinity} Pj x=1,2,3,...
where k is a parameter, Pj is the Poisson probability, and x is a rank.
(This is for rank-frequency data.) In other words, the frequency of an
entity at rank x depends on the sum of frequencies of all entities at
ranks j > x.
Many thanks,
Andrew Wilson