@kknnaabb @_mbdr_ All else equal, a place with few or no poor people, low density single family housing, few or no nursing homes is going to do much better than the opposite. One you count for those differences, the NPI relationship is strong.
@kknnaabb @_mbdr_ 在其他条件相同的情况下，一个很少或没有穷人的地方、低密度的单户住宅、很少或没有疗养院的地方会比相反的情况好得多。考虑到这些差异，NPI 关系很牢固。