在R中制作時間序列數據

Question

我有一個數字變量和一個僅包含年份和月份的日期，我想知道如何獲得時間序列數據。

A<-c(1,2,3,4,55,66,7,88,88,99,99,55,56,6,7,7,8)
Date<-c("1999-01","1999-02","1999-01","1999-10","1999-10","1999-01","1999-01","1999-11","1999-11","1999-01","1999-05","1999-03","1999-12","1999-4","1999-01","1999-12","1999-2")
Data<-data.frame(A,Date)

Answer 1

也許我們可以使用read.zoo

library(zoo)
read.zoo(Data, FUN = as.yearmon, format = "%Y-%m", index.column = 2)