gpw population raster data for Nigeria for the year 2010 used as example for a SpatRaster available from http://sedac.ciesin.columbia.edu/data/collection/gpw-v4. The dataset (gpw-v4) provides population estimates at a grid resolution of about 4km.
data(geomerge)A SpatRaster containing observations.
Karsten Donnay and Andrew M. Linke
Andrew M. Linke, Karsten Donnay. (2017). "Scale Variability Misclassification: The Impact of Spatial Resolution on Effect Estimates in the Geographic Analysis of Foreign Aid and Conflict." Paper presented at the International Studies Association Annual Meeting, February 22-25 2017, Baltimore.