This function is used for input variable screening. It is shown above in its only two active variables. A small error term ε ~ N(0, 0.05 2) is added to the response ...

ε ~ N(0, 0.3 2) to the response. Holsclaw, T., Sanso, B., Lee, H. K., Heitmann, K., Habib, S., Higdon, D., & Alam, U. (2013). Gaussian process modeling of derivative ...