Before revision: The test is based on: using control locations within the general population as the basis of a second or "control" sub-population in addition to the original "case" sub-population; using "nearest-neighbour" analyses to form statistics based on either: the number of other "cases" among the neighbours of each case; the number "cases" which are nearer to each given case than the k'th nearest "control" for that case.
After revision: The test is based on: using control locations within the general population as the basis of a second or "control" sub-population in addition to the original "case" sub-population; using "nearest-neighbour" analyses to form statistics based on either: the number of other "cases" among the neighbours of each case; the number "cases" which are nearer to each given case than the k-th nearest "control" for that case.