由于滚动VaR在缺少完整窗口时出现错误,我已经做了以下操作来估计36个月的滚动VaR(HAM5和HAM6缺少36个月窗口):
library(PerformanceAnalytics)
data(managers)
var<-rollapply(managers,36,function(x){
if(!all(is.na(x))){
return(VaR(x, p=.95, method="modified",align = "right", fill = NA))
} else {
return(NA)
}
})
这样可以正常工作,但在估算预期缺口和预期尾部损失时会出错:
ES<-rollapply(managers,36,function(x){
if(!all(is.na(x))){
return(ES(x, p=.95, method="modified",align = "right", fill = NA,))
} else {
return(NA)
}
})
ETL<-rollapply(managers,36,function(x){
if(!all(is.na(x))){
return(ETL(x, p=.95, method="modified",align = "right", fill = NA,))
} else {
return(NA)
}
})
错误:
Error in if (eval(0 > tmp)) { : missing value where TRUE/FALSE needed
非常感谢“ES”和“ETL”的更正代码。