Comments on: ROI is not just for businesses: how users make ROI judgements http://www.90percentofeverything.com/2009/03/24/roi-is-not-just-for-businesses-how-users-make-roi-judgements/ User Experience Design & Research, written by Harry Brignull Mon, 06 Sep 2010 01:41:08 +0000 hourly 1 http://wordpress.org/?v=3.0.1 By: Top posts of 2009 on 90percentofeverything.com- 90 Percent of Everything http://www.90percentofeverything.com/2009/03/24/roi-is-not-just-for-businesses-how-users-make-roi-judgements/comment-page-1/#comment-116084 Top posts of 2009 on 90percentofeverything.com- 90 Percent of Everything Mon, 07 Dec 2009 09:11:21 +0000 http://www.90percentofeverything.com/?p=596#comment-116084 [...] ROI is not just for businesses: how users make ROI judgements [...] [...] ROI is not just for businesses: how users make ROI judgements [...]

]]> By: Harry Brignull http://www.90percentofeverything.com/2009/03/24/roi-is-not-just-for-businesses-how-users-make-roi-judgements/comment-page-1/#comment-93973 Harry Brignull Wed, 25 Mar 2009 06:17:07 +0000 http://www.90percentofeverything.com/?p=596#comment-93973 You should do a post on Zipf's Law over on your FeraLabs blog. You should do a post on Zipf’s Law over on your FeraLabs blog.

]]> By: James Page http://www.90percentofeverything.com/2009/03/24/roi-is-not-just-for-businesses-how-users-make-roi-judgements/comment-page-1/#comment-93911 James Page Tue, 24 Mar 2009 14:42:49 +0000 http://www.90percentofeverything.com/?p=596#comment-93911 The theory for this is Zipf's "Theory of least effort". From this theory comes Zipf's Law. Which states that we use tools in approximated with a Zipfian distribution. The simplest Zipfian distribution is a "1/f function". Given a set of Zipfian distributed frequencies, sorted from most common to least common, the second most common frequency will occur ½ as often as the first. The third most common frequency will occur 1/3 as often as the first. The nth most common frequency will occur 1/n as often as the first. Many fields use Zipf's "Theory of least effort" including transport economics. The theory for this is Zipf’s “Theory of least effort”. From this theory comes Zipf’s Law. Which states that we use tools in approximated with a Zipfian distribution.

The simplest Zipfian distribution is a “1/f function”. Given a set of Zipfian distributed frequencies, sorted from most common to least common, the second most common frequency will occur ½ as often as the first. The third most common frequency will occur 1/3 as often as the first. The nth most common frequency will occur 1/n as often as the first.

Many fields use Zipf’s “Theory of least effort” including transport economics.

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