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[igraph] why different result for the same data set


From: Weijia You
Subject: [igraph] why different result for the same data set
Date: Fri, 23 Jan 2009 18:28:52 +0800

Dear colleagues,
 
I'm doing the work on getting alpha.
I tried the power.law.fit in igraph first, and get the alpha = 1.85.
------------------the codes are as follows-----------------------------------
>library(igraph)
>g2002911d <- read.graph("o/2002/2002-9-11-dup_r",format="ncol",directed=TRUE)
>g2002dall = degree(g2002911d, mode="all")
>power.law.fit(g2002dall+1)
Call:
mle(minuslogl = mlogl, start = list(alpha = start))
Coefficients:
   alpha
1.848955
However, when I use the plfit (http://www.santafe.edu/~aaronc/powerlaws/plfit.r) to calculate the alpha again, I got
$xmin
[1] 19
$alpha
[1] 2.19
$D
[1] 0.02631497.
 
------------------the codes are as follows-----------------------------------
plfit(g2002dall)
 
I wonder if anyone happen to touch this area before and give me some hints on it.
 
Thank you very much in anticipation!
 
Weijia

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