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AICc to compare the 6 and 7 parameter models
Here, n = 19 and k is the number of parameters in each of the models.
For the 7 parameter “BFGS” method:
RSS = 2345.593
AIC = 161.4456
AICc = AIC + 2k(k+1)/(n-k-1) = AIC + 10.18182 = 161.4456 + 10.18182 = 171.6274
For the 6 parameter “BFGS” method:
RSS = 2873.137
AIC = 163.3000
AICc = AIC + 2k(k+1)/(n-k-1) = AIC + 7 = 163.3000 + 7 = 170.3
Consequently, the 6 parameter “BFGS” model is found to be a slightly, not drastically, better fitted model to the data.