[Ipmpack-users] Defining two fecundity objects

[Sergey Berg]

Good afternoon,

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.

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.

I was successfully able to define the growth and survival objects via these
commands
gr1<-makeGrowthObj(dataf=dat,Formula=sizeNext~size)
sv1<-makeSurvObj(dataf=dat,Formula=surv~size+size2)
but the fecundity objects
fv1<-makeFecObj(dataf=dat,Formula=fec1~size,Family="gaussian",Transform="log")
are giving "Error in split.default(X, group) : first argument must be a
vector"

I've included a portion of the data below if that helps.
         size sizeNext surv fec1 fec2      stage  stageNext
2704  150       NA    0    0   NA continuous continuous
2705  225       NA    0    0   NA continuous continuous
2706  800       NA    0    1  699 continuous continuous
2707 1260       NA    0    1 1279 continuous continuous
2708 1380       NA    0    1 1926 continuous continuous
2709 1859       NA    0    1 1587 continuous continuous
2710  156      165    1    0   NA continuous continuous
2711   72      200    1    0   NA continuous continuous
2712  108      210    1    0   NA continuous continuous

Thank you very much in advance for any advice,

Sergey

-- 
Sergey S. Berg
National Science Foundation Research Fellow
Conservation Biology Graduate Program
FWCB Collegiate Fee Committee
CB Seminar Planning Committee

University of Minnesota
174 McNeal Hall
1985 Buford Ave
St. Paul, MN 55108
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