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Hi Julia, <br>
<br>
Good questions. See some comments below. Also take note:<br>
<br>
1) Version 1.17 of the T-LoCoH package has a bug. If you updated to
that version, <b>please update to v1.18</b> (which was posted
today)<br>
<br>
<tt>update.packages(oldPkgs="tlocoh", repos=<a
class="moz-txt-link-rfc2396E"
href="http://R-Forge.R-project.org">"http://R-Forge.R-project.org"</a>)</tt><br>
or<br>
<tt>install.packages("tlocoh", repos = <a
class="moz-txt-link-rfc2396E"
href="http://R-Forge.R-project.org">"http://R-Forge.R-project.org"</a>)</tt><br>
<br>
2) There's a new tip sheet about time-use analysis on the website
that you might find useful, see <a
href="http://tlocoh.r-forge.r-project.org/tips_faqs.html">http://tlocoh.r-forge.r-project.org/tips_faqs.html</a>.<br>
<br>
Other comments below:<br>
<br>
<div class="moz-cite-prefix">On 9/9/2014 6:33 AM, Julia Krejci
wrote:<br>
</div>
<blockquote cite="mid:002601cfcc32$a621fc70$f265f550$@chello.at"
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<div class="WordSection1">
<p class="MsoNormal"><span lang="EN-GB">Dear tlocoh-list,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">I’ve calculated
revisitation rate and mean duration of visit for some birds
I put GPS-transmitters on. I chose an inter-visit-gap of 12
hours. Maybe I’m already work-blind, but I can’t seem to
understand the intervals the output gives me. <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">If I display the nsv
data, it shows me all points which are considered as
consecutive visits to a hull, right? And the colour code
shows if the individual was there rarely or often. The
intervals of my output are:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">1 – 11.6 <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">11.6 – 22.2 <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">22.2 – 32.8 … and so on.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">So, this means, the
individual revisited this hull once or 22 times during one
inter-visit-gap? That doesn’t seem right. I’m quite sure I’m
missing something.</span></p>
</div>
</blockquote>
<br>
<font color="blue">nsv stands for number of separate visits, where a
visit is defined as not being away from the hull for 12 hours or
more. So the hull where nsv=22 doesn't mean the individual visited
22 times during one intervisit gap period, but rather it was there
and left for more than 12 hours and then came back, 22 times.<br>
<br>
nsv values will of course be integer values. Those ranges you show
I presume are from the plot legend, which R computes by taking the
range of values and chopping it up into equal intervals. But the
nsv values themselves should be all integers<br>
</font><br>
<blockquote cite="mid:002601cfcc32$a621fc70$f265f550$@chello.at"
type="cite">
<div class="WordSection1">
<p class="MsoNormal"><span lang="EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p>It is the
same for the mean duration of visit. This means the mean
number of records taken of an individual during one visit to
the hull, right? But the output gives me<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">1.30 – 11.56<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">11.56 – 21.82 and so on
up to 52.60. <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">This cannot mean the
bird stayed in this hull for 52 records. My GPS interval is
one hour and the transmitters are shut down during the night
to save energy, so they don’t record over night. Maybe I
have to keep that in mind?</span></p>
</div>
</blockquote>
<br>
<font color="blue">A hull where the mnlv=52 means the animal was
within the hull for 52 locations during at least one visit, where
a visit again is defined by a period of separation. Hence that
"one visit" could theoretically go on for several weeks, if for
example the individual left and returned every 11 hours like
clockwork, it would all be considered one visit because your
inter-visit period is 12 hours. That of course is very unlikely,
more probably the hull where mnlv=52 could also contain a bunch of
closely spaced locations, perhaps a site where it stayed for a
long time or returned at intervals shorter than your ivg value,
etc. The tip sheet on the website illustrates how you can
investigate the time use metrics of individual hulls.<br>
</font><br>
<blockquote cite="mid:002601cfcc32$a621fc70$f265f550$@chello.at"
type="cite">
<div class="WordSection1">
<p class="MsoNormal"><span lang="EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p>I tried to
send you a sample image for illustration<span
style="color:#1F497D"> </span>but it seems to be too big
to be sent. <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">I hope my explanation is
understandable. I’d be very grateful for some advice.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Thank you and best
wishes,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Julia <o:p></o:p></span></p>
</div>
<br>
</blockquote>
<br>
H<font color="blue">ope this helps. Let me know what other questions
you come across</font>.<br>
<br>
<blockquote cite="mid:002601cfcc32$a621fc70$f265f550$@chello.at"
type="cite">
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<pre wrap="">_______________________________________________
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</pre>
</blockquote>
<br>
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