Fig. 2

Estimated univariate SFLDA discriminant functions \(\hat{\beta }\) from each kinematic variables. \(\textbf{A}\) Hip. \(\textbf{B}\) Knee. \(\textbf{C}\) Ankle. Discriminant functions from binary classification tasks ‘0 vs. 1’, ‘1 vs. 2’, ‘2 vs. 3’ are shown in the first rows, respectively shown in solid green, dotted purple, and dot–dashed orange curves. The \(\hat{\beta }\) from the task ‘0 vs. {1,2,3}’ is shown in red in the second row