[R-sig-Geo] Directional statistics and weighted mean directions

Greg Snow Greg.Snow at intermountainmail.org
Mon Mar 5 17:28:15 CET 2007

Packages CircStats and circular may help.

Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
greg.snow at intermountainmail.org
(801) 408-8111

> -----Original Message-----
> From: r-sig-geo-bounces at stat.math.ethz.ch 
> [mailto:r-sig-geo-bounces at stat.math.ethz.ch] On Behalf Of 
> Takatsugu Kobayashi
> Sent: Sunday, March 04, 2007 9:16 PM
> To: r-sig-geo at stat.math.ethz.ch
> Subject: Re: [R-sig-Geo] Directional statistics and weighted 
> mean directions
> R users:
> This is more of a general question.
> I am trying to conduct hypothesis testing about the 
> difference of two angles extending from the same point. I am 
> reading directional statistics by Mardia, but it seems to 
> talk about only frequency distribution on the circumference 
> drawn by the unit length vector. My problem involves the 
> weighted mean direction. Weighted by which I mean is that the 
> unit vectors are weighted by the frequencies attached to the 
> census zones. Have anyone known good textbooks and R packages 
> to do directional statistics?
> Thank you very much
> Taka
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