Plot mts (multivariate time series) in ggplot2


ggplot2 does not support ts plot by default, but easily plot after brief data transformation.


# data: class(z) -> mts
z <- ts(matrix(rnorm(300), 100, 3), start=c(1961, 1), frequency=12)

# ggplot2 version. data transformation is critical
ggplot( melt(data.frame(time=as.numeric(time(z)), z), id.vars="time"), aes(time, value)) + 
  geom_line() +
  facet_grid(variable ~ .)

# basic graphics package supports easy mts plot

Here is an example of base graphics version:

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