《因果效应：研究设计与因果关系导论》

this is only for testing that upload is done well

This project demonstrates spatial interpolation techniques using a set of point observations to generate continuous surface maps. I applied Inverse Distance Weighting (IDW) and Ordinary Kriging (OK) using R packages such as gstat, sp, and raster. The analysis includes exploratory spatial data visualization, variogram modeling, and map creation using leaflet. These methods are commonly used in precision agriculture, environmental monitoring, and land-use planning.

Chapter 09 (page 398): 5, 7, 8