I am working with a NDVI image and a an interpolated yield map in ArcGIS 10.3.1. They are both projected in the same coordinate system and the cell sizes are equal. I interpolated the yield harvester points using IDW interpolation method. The final product I want to achieve is the correlation (R-squared). I am new to GIS and have been stuck on this for a while trying to use various spatial analyst tools in ArcToolbox but have been unsuccessful. I have clipped the interpolated yield map to another polygon that I have created, however it does not overlay the NDVI completely.
Is it possible to extract the overlaying pixels values and import this into R software where I can perform further stats?