Question

我有以下数据格式如下

Date  :       Value
1995Q3: 8,540.40
1995Q4: 9,573.90
1996Q1: 8,856.40
1996Q2: 8,841.30
.......

有80个观察结果 Q1，Q2，Q3和Q4代表了今年的四季度。

我很困惑如何使用这样的数据在R中创建时间序列图。我已经探索过互联网，但没有找到任何有用的东西。

Answer 1

这就是你要找的东西吗？

options(stringsAsFactors = F)

data = data.frame(Date = c("1995Q3","1995Q4","1996Q1","1996Q2"), 
              Value = c(8540.40, 9573.90, 8856.40, 8841.30))

data$Date = gsub(pattern = "Q1", replacement = "/1/1", data$Date)
data$Date = gsub(pattern = "Q2", replacement = "/4/1", data$Date)
data$Date = gsub(pattern = "Q3", replacement = "/7/1", data$Date)
data$Date = gsub(pattern = "Q4", replacement = "/10/1", data$Date)


data$Date = strptime(data$Date , format = "%Y/%m/%d")

plot(x = 1:4, y = data$Date, type = "l")

Answer 2

此代码将执行此操作

# Your data        
        a<- rbind(c("1995Q3", 8540.40),c("1995Q4", 9573.90),
                          c("1996Q1", 8856.40), c("1996Q2", 8841.30))
                dates <- a[,1]
# convert dates to years with fraction
                year <- as.numeric(substring(dates,1,4)) + (as.numeric(substring(dates,6,6))-1)/4
                values <- as.numeric(a[,2])
#time series starting with the first value and quarterly data
                a<- ts(values,start = year[1], frequency = 4 )
                print(a)
                plot(a)

创建时间序列图

2 个答案: