Adjacency structure of the counties in the contiguous United States
在美国本土的县邻接结构
译者:生物统计家园网 机器人LoveR
描述----------Description----------
First and second order adjacency structure of the counties in the contiguous United States. We consider that two counties are neighbors if they share at least one edge of their polygon description in maps.
第一和第二阶邻接结构在美国本土的县。我们认为,两个县是邻居,如果他们共享至少一个边缘的多边形描述maps。
格式----------Format----------
Two matrices of class spam
两个矩阵类spam
Contains a one in the i and j element if county i is a neighbor of county j.
包含在一个i和j元素,如果县i是邻居县j的。
Contains a one in the i and j element if counties i and j are a neighbors of county k and counties i and j are not neighbors.
包含在一个i和j元素,如果县i和j是一个邻居的县k县i和j是不是邻居。
参见----------See Also----------
map from maps.
mapmaps。
实例----------Examples----------
# number of counties:[一些县:]
n <- nrow( UScounties.storder)
## Not run: [#不运行:]
# make a precision matrix [一个精确的矩阵]
Q <- diag.spam( n) + .2 * UScounties.storder + .1 * UScounties.ndorder
display( as.spam( chol( Q)))