8
我有以下的時間序列na.locf但不這樣做結尾港定居
> y<- xts(1:10, Sys.Date()+1:10)
> y[c(1,2,5,9,10)] <- NA
> y
[,1]
2011-09-04 NA
2011-09-05 NA
2011-09-06 3
2011-09-07 4
2011-09-08 NA
2011-09-09 6
2011-09-10 7
2011-09-11 8
2011-09-12 NA
2011-09-13 NA
直na.locf給我這個：
> na.locf(y)
[,1]
2011-09-04 NA
2011-09-05 NA
2011-09-06 3
2011-09-07 4
2011-09-08 4
2011-09-09 6
2011-09-10 7
2011-09-11 8
2011-09-12 8
2011-09-13 8
我如何得到這個？
[,1]
2011-09-04 NA
2011-09-05 NA
2011-09-06 3
2011-09-07 4
2011-09-08 4
2011-09-09 6
2011-09-10 7
2011-09-11 8
2011-09-12 NA
2011-09-13 NA
我不想結轉最後觀察除了最後一個非缺失值..即不會被替換後港定居。非常感謝你的幫助！