A Machine Learning Centered Approach for Uncovering Excavators’ Last Known Location Using Bluetooth and Underground WSN

Table 1

RMSE and R² values for different models on the training dataset.

Model	RMSE	R^2
Linear regression	1.79	0.79
K-nearest neighbor	1.25	0.89
Decision tree	1.05	0.92
Random forest	1.07	0.92