4 Sep 2008 12:57

## Re: Betweenness centrality with parallel edges

```Hi Tiago,

Thanks for considering it.

Until you implement it, my understanding is that to get absolute betweenness values we need to multiply
node/edge betweenness by the following factors:
Node betweenness: (N-1)*(N-2)/2
Edge betweenness: N*(N-1)/2

Is this correct?

Cheers,
Rui

P.S.: good luck with the post-doc work ;)

-----Original Message-----
From: graph-tool-bounces <at> forked.de [mailto:graph-tool-bounces <at> forked.de] On Behalf Of Tiago de
Paula Peixoto
Sent: 02 September 2008 14:04
To: Main discussion list for the graph-tool project
Subject: Re: [graph-tool] Betweenness centrality with parallel edges

Hello Rui,

On 09/01/2008 01:05 PM, Rui Carvalho wrote:
> Tiago, would it be possible to include a flag in graph-tool so we can
> choose to compute normalized/non-normalized betweeness?

I don't object at all to this. I'm incredibly busy at the moment, but I'll see around to implementing this as
```

4 Sep 2008 13:09

### Re: Betweenness centrality with parallel edges

```Hi Rui,

On 09/04/2008 12:57 PM, Rui Carvalho wrote:
> Until you implement it, my understanding is that to get absolute
> betweenness values we need to multiply node/edge betweenness by the
> following factors:
> Node betweenness: (N-1)*(N-2)/2
> Edge betweenness: N*(N-1)/2
>
> Is this correct?

Yes, this is correct for undirected graphs. For directed graphs it
becomes (n-2)*(n-1) and n*(n-1), for vertex and edge betweenness
respectively.

> P.S.: good luck with the post-doc work ;)

Thanks.

Cheers,
Tiago

--

--
Tiago de Paula Peixoto <tiago <at> forked.de>

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