After publication, the authors discovered a minor bug in the code used to produce the results published in “Applications of Gaussian-Inverse Wishart Process Regression Models in Claims Reserving.”
This bug resulted in a numerical error in the data presented in Table 4 and slight alterations in the graphs shown in Figures 8 to 12. While these corrections affect some reported values, they do not impact the methodology or the overall conclusions of the paper.
The revised table, along with updated commentary and code, has been uploaded to the GitHub repository (https://github.com/marcopark90/GaussianProcesses). It is also presented here.
Commentary
It is worth noting that even in the most divergent case, the GPR absolute percentage error on the observed values is 4.7%, compared to 1.9% for the ODP. The two methodologies yield reasonably similar results.