An automatic procedure to determine groups of nonparametric regression curves
This method addresses the problem of automatically grouping nonparametric regression curves for researchers and engineers analyzing large datasets, such as in tunnel geometry studies.
This paper proposes an automatic testing procedure to group nonparametric regression curves, which is particularly useful when dealing with a large number of curves. The method was applied to analyze tunnel geometry from cross-sections, revealing heterogeneity.
In many situations it could be interesting to ascertain whether nonparametric regression curves can be grouped, especially when confronted with a considerable number of curves. The proposed testing procedure allows to determine groups with an automatic selection of their number. A simulation study is presented in order to investigate the finite sample properties of the proposed methods when compared to existing alternative procedures. Finally, the applicability of the procedure to study the geometry of a tunnel by analysing a set of cross-sections is demonstrated. The results obtained show the existence of some heterogeneity in the tunnel geometry.