Editorial note: My column in Spatial Demography examines computer software and program code. One of the key issues facing any scholar is “how” to implement a particular analysis. Much of this activity has been fugitive from the formal literature but the recent trend toward sharing software features and programmable code is helping to reduce this confusion. This column will feature some tools that will assist spatial demographers in their craft. Suggestions or questions are welcomed in the Spatial Demography Forum on the journal website.