Research Article
On the Investigation of Effective Factors on Higher Heating Value of Biodiesel: Robust Modeling and Data Assessments
Figure 3
Relative deviations of the GPR models versus HHV measurements under the (a) exponential, (b) Matern, (c) squared exponential, and (d) rational quadratic kernel functions.
| (a) |
| (b) |
| (c) |
| (d) |