Directional data in time series
/*----------------------------------------------------------------------------------------------------------------------------- Jeffrey D. Holland, Professor jdhollan at purdue.edu Dept. of Entomology, Purdue University 765 / 494-7739 Section Editor, Current Landscape Ecology Reports Skype: ecobugprof Associate Editor, Landscape Ecology www.entm.purdue.edu/landscapeecology Fellow of the Indiana Academy of Science http://www.bugsmapsandmath.com -------------------------------------------------------------------------------------------------------------------------------*/
From: Holland, Jeffrey D
Sent: Tuesday, September 4, 2018 7:36 AM
To: g.cerritelli
Subject: Re: [R-sig-eco] Directional data in time series
Sent: Tuesday, September 4, 2018 7:36 AM
To: g.cerritelli
Subject: Re: [R-sig-eco] Directional data in time series
Dear Giulia,
I would suggest reading the book on Circular Statistics by Fisher---it is excellent. Perhaps if you plotted the cosine of the direction on the x-axis?
Cheers,
Jeff
/*-----------------------------------------------------------------------------------------------------------------------------
Jeffrey D. Holland, Professor jdhollan at purdue.edu
Dept. of Entomology, Purdue University 765 / 494-7739
Section Editor, Current Landscape Ecology Reports Skype: ecobugprof
Associate Editor, Landscape Ecology www.entm.purdue.edu/landscapeecology
Fellow of the Indiana Academy of Science http://www.bugsmapsandmath.com
-------------------------------------------------------------------------------------------------------------------------------*/
________________________________________
From: R-sig-ecology <r-sig-ecology-bounces at r-project.org> on behalf of g.cerritelli <giulia.cerritelli at biologia.unipi.it>
Sent: Tuesday, September 4, 2018 6:38 AM
To: r-sig-ecology at r-project.org
Subject: [R-sig-eco] Directional data in time series
Dear R list,
I have data on the heading kept by an animal during a migratory
movement. I would like to represet this data not using a circular plot
but on a xy-plot, to represent the change of kept directions over time.
I have tried already to do this, but because the animal keeps always a
direction between 30? and 250?, the final plot is not easily readable
(the northern directions represented by 0? and 360? are represented at
the opposite sides of the axis). Do you have any ideas on how to set the
order of a continuos variable (from 0 to 360)in a different way for the
axis of a plot? For example I would like to have an y-axis starting at
180? and ending at 179?, with 360? next to 0? (so to have values
indicating the North all in the same area of the axis). Thank you in
advance for any suggestion
Kind regars,
Giulia
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