我正在 R 上做一个空间计量经济学项目。我有一个包含 81 个国家的数据库，我使用包在世界地图上绘制了这些数据库rworldmap。我必须创建一个权重矩阵来进行莫兰图和计量经济学评估，但我想找到一种方法来只考虑包含数据的国家。否则，当我尝试绘制 Moran 图时，它总是返回数据和权重矩阵长度不同的错误。
这是我正在使用的代码：
library(rworldmap)
library(spdep)
worldmap <- joinCountryData2Map(database, joinCode = "ISO3", nameJoinColumn = "code")
# Recovery of centroids from employment areas
coor <- coordinates(worldmap)
# Definition of the 3 closest neighbors
cartePPV3.knn <- knearneigh(coor, k=3)
cartePPV3.nb <- knn2nb(cartePPV3.knn)
# weight matrix for the 2 closest neighbors
PPV3.w <- nb2listw(cartePPV3.nb, style = "W", zero.policy = TRUE)
print(PPV3.w, zero.policy=TRUE)
## Characteristics of weights list object:
## Neighbour list object:
## Number of regions: 243
## Number of nonzero links: 729
## Percentage nonzero weights: 1.234568
## Average number of links: 3
## Non-symmetric neighbours list
## Weights style: W
## Weights constants summary:
## n nn S0 S1 S2
## W 243 59049 243 133.8889 10
但是对象 PPV3.w 的长度为 243，我的数据长度为 81。您对如何克服这个问题有什么建议吗？
database <- structure(list(code = c("ARG", "ARM", "AUS", "AUT", "AZE", "BEL", "BGR", "BHS", "BLR", "BOL", "BRA", "BWA", "CAN", "CHE", "CHL",
"CHN", "CIV", "COD", "COL", "CYP", "CZE", "DEU", "DOM", "EGY",
"ESP", "EST", "FIN", "FRA", "GAB", "GBR", "GHA", "GMB", "GTM",
"HND", "HRV", "HTI", "HUN", "IDN", "IND", "IRL", "IRQ", "ISR",
"ITA", "JAM", "JOR", "JPN", "KEN", "KOR", "KWT", "LBR", "LBY",
"LTU", "LUX", "LVA", "MAR", "MEX", "MLT", "MWI", "MYS", "NLD",
"NOR", "NZL", "PAN", "PER", "PHL", "POL", "PRT", "PRY", "RUS",
"SAU", "SDN", "SEN", "SWE", "THA", "TTO", "TUR", "VEN", "VNM",
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