使用ggplot2同时绘制时间序列和预测

Question

我有一个带有预测和置信区间数据的时间序列，我想用ggplot2同时绘制它们。我是通过下面的代码来实现的：

set.seed(321)
library(ggplot2)
#create some dummy  data similar to mine

sample<-rnorm(350)
forecast<-rnorm(24)
upper<-forecast+2*sd(forecast)
lower<-forecast-2*sd(forecast)


## wrap data into a data.frame
df1 = data.frame(time = seq(325,350,length=26), M = sample[325:350], isin = "observations")
df2 = data.frame(time = seq(351,374,length=24), M = forecast , isin = "my_forecast")
df3 = data.frame(time = seq(351,374,length=24), M = upper ,isin = "upper_bound")
df4 = data.frame(time = seq(351,374,length=24), M = lower, isin = "lower_bound")
df = rbind(df1, df2, df3, df4)

## ggplot object 
ggplot(df, aes(x = time, y = M, color = isin)) + geom_line()

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如何将上下线条合并为一种颜色？另外，如何设置预测和采样的特定颜色？

Answer 1

使用scale_colour_manual

ggplot(df, aes(x = time, y = M, color = isin)) + geom_line() + 
    scale_colour_manual(values=c(observations='blue', my_forecast='red', upper_bound='black', lower_bound='black'))

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编辑

这是另一种选择，灵感来自@rnso answer。

ggplot(df1, aes(x = time, y = M)) + geom_line(colour='blue') +
    geom_smooth(aes(x=time, y=M, ymax=upper_bound, ymin=lower_bound), 
                colour='red', data=df5, stat='identity')

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Answer 2

以下内容可能会有所帮助：

ggplot() + 
  geom_line(data=df1, aes(x = time, y = M, color = isin)) + 
  stat_smooth(data=df2, aes(x = time, y = M, color = isin))

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也可以在stat_smooth()中使用'method'选项