Message-ID: <54612.98.122.165.51.1265230174.squirrel@webmail.ncsu.edu>
Date: 2010-02-03T20:49:34Z
From: Kristen M. Kostelnik
Subject: clumping vs. random
In-Reply-To: <25430_1265227616_o13K6mHF011015_1aef26221002031201t3c104a50iab6b7e7d4 41c09ff@mail.gmail.com>
Hello list,
It seems this should be quite a basic question, but I have no idea how to
approach it. For 100s of sites, I have an environmental variable that has
occurences over a 20 year period. I am looking for a way to create an
index between 0 and 1 that represents the degree of clumpiness vs.
randomness over time. Where 0 is totally clumped and 1 is totally spaced
out evenly.
So for example:
Site Year1 Year2 Year3 Year4......Year19 Year20 Total Index
1 Yes Yes Yes Yes No No 10 0
2 Yes No Yes No Yes No 10 1
Yes and No can be converted to 1 and 0. I am not sure what you call this
sort of index, technically, so I am not sure how to search for an
appropriate method. I am, obviously, looking for a way to do this in R.
Thanks for any suggestions!
Kind Regards,
Kristen