Least squares approximations 55 Partial least square (PLS) 8 Forecasting 7 Regression analysis 7 China 5 Decision trees 5 Least-squares- methods 5 Linear regression 5 Mean square error 5 least square analysis 5 Learning algorithms 4 Least-Squares Analysis 4 Numerical methods 4 Optimization 4 Remote sensing 4 Support vector machines 4 Surveys 4 Sustainable development 4 Biomass 3 Channel estimation 3 Channel state information 3 Climate change 3 Communication channels (information theory) 3 Errors 3 Forestry 3 Frequency estimation 3 Infrared devices 3 Inverse problems 3 Land use 3 Machine learning 3