Research Paper Volume 12, Issue 5 pp 4617—4640

Figure 6. Exemplary demonstration of locally weighted regression fit for the two-handed Purdue Pegboard Test (PPT_2) including the position of the calculated maximal and minimal value of the fit (triangles). The optimal fitting model, here a piecewise linear regression with the breakpoint (BP) at 32 years, was chosen based on significance of the model and its parameters, R²_adjusted, and Akaike Information Criterion (AIC). Ribbons depict the 95% confidence interval of the fit.