R 生成虚构的面板数据集
我想创建一个虚构的面板数据集,包含100个面板观察(50对),变量为:panelID、country和year。这意味着每个panelID应该有相同的国家,但有不同的年份(哪一年不重要,但假设相隔4年) 我试着做了以下几件事,但没有成功R 生成虚构的面板数据集,r,data.table,R,Data.table,我想创建一个虚构的面板数据集,包含100个面板观察(50对),变量为:panelID、country和year。这意味着每个panelID应该有相同的国家,但有不同的年份(哪一年不重要,但假设相隔4年) 我试着做了以下几件事,但没有成功 panelID = c(1:50) year= c(2001:2010) country = c("NLD", "GRC", "GBR") DT <- data.table(expand.grid(panelID, year, country))
panelID = c(1:50)
year= c(2001:2010)
country = c("NLD", "GRC", "GBR")
DT <- data.table(expand.grid(panelID, year, country))
panelID=c(1:50)
年份=c(2001:2010)
国家=c(“全国民主联盟”、“GRC”、“GBR”)
DT我认为这是预期的结果:
panelID = c(1:50)
year= c(2001:2010)
country = c("NLD", "GRC", "GBR")
n <- 2
library(data.table)
set.seed(123)
data.table(panelID = rep(sample(panelID), each = n),
country = rep(sample(country, length(panelID), replace = T), each = n),
year = c(replicate(length(panelID), sample(year, n))))
panelID country year
1: 31 GBR 2010
2: 31 GBR 2005
3: 15 NLD 2005
4: 15 NLD 2008
5: 14 GRC 2003
6: 14 GRC 2002
7: 3 NLD 2010
8: 3 NLD 2002
9: 42 NLD 2010
10: 42 NLD 2006
... 100 rows total
panelID=c(1:50)
年份=c(2001:2010)
国家=c(“全国民主联盟”、“GRC”、“GBR”)
N
panelID = c(1:50)
year= c(2001:2010)
country = c("NLD", "GRC", "GBR")
n <- 2
library(data.table)
set.seed(123)
data.table(panelID = rep(sample(panelID), each = n),
country = rep(sample(country, length(panelID), replace = T), each = n),
year = c(replicate(length(panelID), sample(year, n))))
panelID country year
1: 31 GBR 2010
2: 31 GBR 2005
3: 15 NLD 2005
4: 15 NLD 2008
5: 14 GRC 2003
6: 14 GRC 2002
7: 3 NLD 2010
8: 3 NLD 2002
9: 42 NLD 2010
10: 42 NLD 2006
... 100 rows total
#for 4 years apart
set.seed(123)
years <- sample(2001:2006, length(panelID), replace = T)
set.seed(123)
data.table(panelID = rep(sample(panelID), each = n),
country = rep(sample(country, length(panelID), replace = T), each = n),
year = c(t(matrix(c(years, years+4), ncol = n))))