Table 2.

Step length average RMSE and standard deviation of five ML models and one biomechanical model for the test set (recall Table 1, top panel)

Model	LR	RT	SVM	KNN	XGBoost	Inverted Pendulum
RMSE [cm]	6.46 ± 0.20	7.43 ± 0.23	6.31 ± 0.30	7.07 ± 0.21	6.08 ± 0.15	20.60 ± 0.77
ICC (2,1)	0.89 ± 0.01	0.85 ± 0.01	0.89 ± 0.01	0.86 ± 0.01	0.91 ± 0.003	0.54 ± 0.24

The test set refers to Table 1 top panel. Values are presented as mean ± standard deviation.

RMSE root mean square error, LR linear regression, RT regression tree, SVM support vector machine, KNN K-nearest neighbors, XGBoost extreme gradient boosting, ICC intraclass correlation coefficient.