makeOffspringObj | R Documentation |
A function that fits regressions that define offspring size and from these build growth objects for which methods to build an IPM object are defined; alternatively, the function creates offspring objects following a specified formula with specified coefficients and sd. Note that if an "offspringNext" column is available in the data, the data will be subsetted based on whether offspringType="sexual" or "clonal" (the default is "sexual"); - otherwise, appropriate data must be supplied.
makeOffspringObj(dataf=NULL, Formula = sizeNext ~ size, regType = "constantVar", Family = "gaussian", link = NULL, coeff=NULL,sd=NULL, reproductionType="sexual")
dataf |
a dataframe with columns ‘size’ and ‘sizeNext’(‘size’ is size of parent at t, and may not be known, ‘sizeNext’ is offspring size at t+1); facultatively, dataf may include ‘covariate’ and ‘covariatel’ for a single discrete covariate, indicating values at t, and at t+1, respectively; these must take values of sequential integers, starting at ‘1’. |
Formula |
a formula describing the desired
explanatory variables (interactions, etc) according to the R notation for |
regType |
possible values include ‘constantVar’ or ‘changingVar’ |
Family |
possible values include ‘gaussian’, ‘poisson’, ‘negbin’ |
link |
defaults to NULL, currently only relevant with Family="negbin", and only "log" and "identity" are permitted |
coeff |
numeric vector of required coefficients to be imposed if dataf is NULL; must be compatible with Formula |
sd |
numeric of required sd to be imposed if dataf is NULL |
reproductionType |
whether the relationship should be fitted for sexual or clonal offspring; the default is "sexual"; this will only be relevant if data is provided and has a column "offspringNext" |
An object of class growthObj, or growthObjPois, growthObjIncr, or growthObjLogIncr; or growthObjDeclineVar, or growthObjIncrDeclineVar, or growthObjLogIncrDeclineVar. These are S4 objects which contain the slots:
fit |
an object of class |
Slots can be listed by using slotNames(growthObj)
Note that DeclineVar objects cannot currently be constructed without a data-frame.
C. Jessica E. Metcalf, Sean M. McMahon, Roberto Salguero-Gomez & Eelke Jongejans
makeGrowthObj
, makeSurvObj
, makeFecObj
#generate data dff <- generateData() #make simple linear regression growth object relating size to size at t+1 off1 <- makeOffspringObj(dataf = dff, Formula = sizeNext~1) #now specifying parameters and supplying no data off1 <- makeOffspringObj(Formula = incr ~ size + covariate,coeff=c(1,1,1),sd=1) ##make an Fmatrix with this dff<-generateData() dff$fec[dff$fec==0] <- NA off1 <- makeOffspringObj(dataf = dff, Formula = sizeNext~1) fv1 <- makeFecObj(dff, Formula = fec~size, Transform = "log", doOffspring=FALSE) Fmatrix1 <- makeIPMFmatrix(fecObj = fv1, nBigMatrix = 20, minSize = min(dff$size, na.rm = TRUE), maxSize = max(dff$size, na.rm = TRUE), correction="constant", offspringObj=off1) #compare with the other approach (where offspring object is not separate) fv2 <- makeFecObj(dff, Formula = fec~size, Transform = "log", offspringSizeExplanatoryVariables = "1", doOffspring=TRUE) Fmatrix2 <- makeIPMFmatrix(fecObj = fv2, nBigMatrix = 20, minSize = min(dff$size, na.rm = TRUE), maxSize = max(dff$size, na.rm = TRUE), correction="constant", offspringObj=NULL) par(mfrow=c(1,2)) image(Fmatrix1); image(Fmatrix2)
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