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Today's Topics:
1. Plant biomass (john polo)
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Message: 1
Date: Mon, 05 Apr 2010 15:56:44 -0500
From: john polo <jpolo at mail.usf.edu>
To: r-sig-ecology at r-project.org
Subject: [R-sig-eco] Plant biomass
Message-ID: <4BBA4E8C.6000900 at mail.usf.edu>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Hello,
I have biomass measurements of plant functional groups that range from
.002 g to 2000 g, with quite a few zeros in two of the groups as well.
While trying to analyze this data, the negative binomial distribution
was suggested for describing the data, with zero inflation for the 2
groups. However, negative binomial doesn't allow for non-integer values.
I have two questions, the first of which is, is negative binomial the
appropriate distribution to use for this range of masses with several
zeros? Contingent on negative binomial being the appropriate
distribution, how do I correct for non-integer values of my masses?
Best regards,
John Polo
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End of R-sig-ecology Digest, Vol 25, Issue 3
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