search for: growth_interv

...M models, and 4 covariates: mean size, mean capture year, growth interval, having tumors vs. not The models work fine, and fit the data well, however when I try to compare models using AIC I cannot get an AIC value. This is the code for the gam model: >model1=gam(growth_rate~s(sampling_year)+s(growth_interval)+s(mean_SCL)+FP_status,family=quasi(link=identity),method="REML") > AIC(model1) [1] NA or: > model2=gam(growth_rate~s(sampling_year)+s(mean_SCL),family=quasi(link=identity),method="REML") > AIC(model1,model2) df AIC model1 13.722861 NA model2 9.898634...