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hbcom
2012 Sep 10
0
More help need on Von Bertalanffy Growth Curves
...tf <- as.factor(Cohort)
# fit a single model with different parameter estimates for each Cohort
vbGen <- Length~Linf[Cohortf]*(1-exp(-K[Cohortf]*(Age-t0[Cohortf])))
fitGen <- nls(vbGen,data=BLG,start=svGen)
#fit a single model with the same parameter estimates using all the Cohorts data#
vbCom <- Length~Linf*(1-exp(-K*(Age-t0)))
fitCom <- nls(vbCom,data=BLG,start=svCom)
overview(fitCom)
# Checking assumptions#
#want residual plot to look like a shot gun blast, no funnels, no trends, no arches, (ie Unbiased and homoscedastic)#
residPlot(fitCom)
#Want histogram to be normally...