As we have seen in other “Spatial analysis” series tutorials, lots of archaeological data are spatial: think about a map describing the results of a survey, or the plan of an excavated household. However, once such maps are done, little remains to do.
It's not the same if you have collected samples. You should find a way to interpolate the measures taken on the samples so that the whole of your surface can be investigated.
We'll be using GRASS and R in this tutorial.
Two useful tutorials about Ordinary Kriging: