Spatial Analysis This section considers the geographical tools available to analyse the spatial dispersion of surnames. Amongst those introduced are: Index Numbers Mean Separation Distance Nearest Neighbour Analysis Lorenz Curves Explanation of these techniques (except for Mean Separation Distance) is based on two A Level texts: Martin Mowforth Statistics for Geographers, Harrap, 1979 Lenon and Cleves Techniques and Fieldwork in Geography, (2nd ed) 2000