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

Table 2

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

Model	RMSE	R^2
Linear regression	1.78	0.76
K-nearest neighbor	1.45	0.84
Decision tree	1.62	0.81
Random forest	1.43	0.85