[R] Ellipse that Contains 95% of the Observed Data
gunter.berton at gene.com
Mon Mar 29 18:43:43 CEST 2010
Easy. See below.
Genentech Nonclinical Biostatistics
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On
Behalf Of Tom La Bone
Sent: Monday, March 29, 2010 6:56 AM
To: r-help at r-project.org
Subject: Re: [R] Ellipse that Contains 95% of the Observed Data
Concisely, here is what I am trying to do:
#I take a random sample of 300 measurements. After I have the measurements
#I post stratify them to 80 type A measurements and 220 type B measurements.
#These measurements tend to be lognormally distributed so I fit them to
#determine the geometric mean and geometric standard deviation of each
#The question is: are the geometric mean and geometric standard deviation of
#the type A measurements the same as the geometric mean and geometric
#standard deviation of the type B measurements?
(So you probably need to
1. Ask a more statistically meaningful question.
2. Get a MUCH larger sample (you're talking about bivariate sd's here!!)
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