Message-ID: <OFAFDDB315.32D81784-ON852576AA.0066A9C4-852576AA.0067465C@nps.gov>
Date: 2010-01-13T18:48:02Z
From: Steve_Friedman at nps.gov
Subject: Formula for normal distribution with know mean and standard error and n terms
Hello,
I am searching for a method to calculate a normal distribution.
For example this equation is used to calculate the normal curve when the
mean and standard deviation are know.
p(x) = (1/?*sqrt(2?)) x exp (- (x-?)2/2?2)
or
(Embedded image moved to file: pic27350.jpg)Normal Probability Distribution
Formula
However, some of the literature I'm reading (I'm building an ecological
niche model for vegetation along several ecological gradients) report the
standard error instead and n sample size. Is there an equivalent formula ?
If so, how can I also normalize the p(x) term to be within the 0-1 range?
Thank you all
Steve
Steve Friedman Ph. D.
Spatial Ecological Analyst
Everglades and Dry Tortugas National Park
950 N Krome Ave (3rd Floor)
Homestead, Florida 33034
Steve_Friedman at nps.gov
Office (305) 224 - 4282
Fax (305) 224 - 4147