## Qian et al. (2008) Function

### Description:

*Dimensions: 2*

This function has one quantitative and one qualitative input variable. The plot above shows the function for both possible values of the qualitative z-variable.

### Input Domain:

The quantitative variable x is in [0, 1], and the qualitative variable z takes on one of the two possible values in {1, 2}.### Code:

### Reference:

Qian, P. Z., Wu, H., & Wu, C. J. (2008). Gaussian process models for computer experiments with qualitative and quantitative factors. *Technometrics, 50*(3).

For questions or comments, please email Derek Bingham at: dbingham@stat.sfu.ca.

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