Re: [R] Identifying peak periods of observations in circular yearly data

;), > + template="geographics", zero=0, tcl.text=.15) >> arrows.circular(quantile(circ, prob=c(.10, .90)), lwd=2) > > ------------- > David L Carlson > Department of Anthropology > Texas A&M University > College Station, TX 77840-4352

Re: [R] Identifying peak periods of observations in circular yearly data

From: R-help [mailto:r-help-boun...@r-project.org] On Behalf Of Daisy Englert Duursma Sent: Wednesday, May 27, 2015 4:42 AM To: Jim Lemon Cc: r-help@R-project.org Subject: Re: [R] Identifying peak periods of observations in circular yearly data Thanks for the advice Jim. I did actually play around with t

Re: [R] Identifying peak periods of observations in circular yearly data

Thanks for the advice Jim. I did actually play around with this idea, but for some bird species (emu) the beginning of the breeding season is actually January while for others it is in July or at other times. Breeding seasons can be driven by dry season or temperatures, so although there are genera

Re: [R] Identifying peak periods of observations in circular yearly data

Hi Daisy, You face a problem similar to one with which I have grappled in different fields. The year is designed for the northern hemisphere, beginning and ending in less productive biologic states in those regions. I have previously argued that since the calendar year is an arbitrary progression,

[R] Identifying peak periods of observations in circular yearly data

Greetings, I am trying to identify at which point during the year 80% of bird breeding observations are. typically I would answer a question like this by finding the median or quartiles but how do I deal with situations where the 80% of the is from day 285 through day 366 (leap year) and extends t