R, Machine Learning, Nonlinear Regression.
are used. 3 knots are determined with 0.1, 0.5 and 0.9 quantiles (quantile) of the data set. However, if desired, knots values can be changed. These quantile values appear to give better results in this data set. RMSE and R-squared values are “4.958616” and “0.6911364”, respectively. We can say