# Talk:Ban (information)

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## Request for references

Request for references: I suppose some of it is still classified, but nonetheless, are there any references for this article, particularly pertaining to Turing's and Good's work? I added a couple of references to the article, but they only pertain to the material I added about Hartley. 130.94.162.64 22:52, 25 November 2005 (UTC)

The material is now in the Ban (information ) page. This page can be deleted. —Comment added 19:33, 19 November 2006 (UTC) by User:Grgarza (talk) — Preceding unsigned comment added by SudoMonas (talkcontribs)

## Graphical Tables

So, who wants to convert these tables into regular ones? I'm about to go to bed, but I will mark this page and do it tomorrow if nobody else has by then. --Grey Knight 00:05, 20 November 2006 (UTC)

## Citation needed

There was a [citation needed] tag in the sentence "decibans corresponds to an odds ratio of 10:1; 20 decibans to 100:1 odds, etc". That is relatively straightforward math (see bellow) so I presume it refers to the use of it as in "The deciban is a particularly useful measure of information in odds-ratios or weights of evidence" and moved it there.

Given a event with odds 1:n, then the information is $I = -log\left(\frac{1}{n+1}\right)-log\left(\frac{n}{n+1}\right)$.

For n "large", $I \approx -log\left(\frac{1}{n}\right)-log\left(\frac{n}{n}\right) = log(n)$

So, for $n=10^k\,,k=1,2,..$, then $I \approx log(10^k) = k\;[ban]$. - Nabla (talk) 16:35, 22 April 2008 (UTC)

If we use probability 1/n instead of 1:n odds, there's no need to stipulate "for large n". --Doradus (talk) 16:29, 20 July 2011 (UTC)

## SI units

Ban is not an SI unit but neither is bit. I guess there is no SI unit for information. 92.45.131.185 (talk) 03:38, 31 January 2014 (UTC)