Hi Everybody Is there a possibility to create a neighbourhood list with a custom contiguity condition? There is queen and rook contiguity but I need something which may be called "Knight" : i.e. skip two (in a certain direction) and choose the next one.
Here is my problem: I have a multi-stage sampling plan for a household survey. This involves defining street blocks from a SPDF of houses (which thanks to the help of Roger on this list I am now able to do using poly2nb and n.comp.nb), then selecting a number of random street blocks where the survey will take place. In each block we take a random starting point and move around the block and interview every third household from until we reach the starting point again. I need to make a neighbourhood list which will give me these every third house in a certain direction from the starting point. This means the contiguity condition would be something like: "skip the house to the left, skip the house to its left , take the house to its left and select it, repeat until you reach a number that has already been evaluated then stop. I would appreciate any ideas best regards Christiaan _______________________________________________ R-sig-Geo mailing list R-sig-Geo@stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-sig-geo
