Good afternoon,<br><br>I am hoping to get some help in using IPMpack for evaluating the population growth rate of a monocarpic plant species. I've read the documentation provided for the IPMpack R package, but I'm
having a bit of trouble with defining the fecundity objects.<br>
<br>I have five main parameters - size, sizeNext, surv, fec1, and fec2.
fec1 is a binary variable that measures if a plant successfully produced
offspring (and subsequently died, fec1=1) or not (fec1=0). fec2 is the
number of offspring produced by the plant given fec1=1. I'm trying to
understand whether these two variables need to create separate fecundity
objects or if they should be combined into a single object, and how to
do so.<br><br>I was successfully able to define the growth and survival objects via these commands<br>gr1<-makeGrowthObj(dataf=dat,Formula=sizeNext~size)<br>sv1<-makeSurvObj(dataf=dat,Formula=surv~size+size2)<br>but the fecundity objects<br>
fv1<-makeFecObj(dataf=dat,Formula=fec1~size,Family="gaussian",Transform="log")<br>are giving "Error in split.default(X, group) : first argument must be a vector"<br><br>I've included a portion of the data below if that helps.<br>
size sizeNext surv fec1 fec2 stage stageNext<br>2704 150 NA 0 0 NA continuous continuous<br>2705 225 NA 0 0 NA continuous continuous<br>2706 800 NA 0 1 699 continuous continuous<br>
2707 1260 NA 0 1 1279 continuous continuous<br>2708 1380 NA 0 1 1926 continuous continuous<br>2709 1859 NA 0 1 1587 continuous continuous<br>2710 156 165 1 0 NA continuous continuous<br>
2711 72 200 1 0 NA continuous continuous<br>2712 108 210 1 0 NA continuous continuous<br><br>
Thank you very much in advance for any advice,<br><br>Sergey<br clear="all"><br>-- <br>Sergey S. Berg<br>National Science Foundation Research Fellow<br>Conservation Biology Graduate Program<br>FWCB Collegiate Fee Committee<br>
CB Seminar Planning Committee<br><br>University of Minnesota<br>174 McNeal Hall<br>1985 Buford Ave<br>St. Paul, MN 55108