plot.bsts.prediction function

Plot predictions from Bayesian structural time series

Plot the posterior predictive distribution from a bsts prediction object.

## S3 method for class 'bsts.prediction'
plot(x,
     y = NULL,
     burn = 0,
     plot.original = TRUE,
     median.color = "blue",
     median.type = 1,
     median.width = 3,
     interval.quantiles = c(.025, .975),
     interval.color = "green",
     interval.type = 2,
     interval.width = 2,
     style = c("dynamic", "boxplot"),
     ylim = NULL,
     ...)

Arguments

• x: An object of class bsts.prediction

  created by calling predict on a bsts object.

• y: A dummy argument necessary to match the signature of the plot generic function. This argument is unused.

• plot.original: Logical or numeric. If TRUE then the prediction is plotted after a time series plot of the original series. If FALSE, the prediction fills the entire plot. If numeric, then it specifies the number of trailing observations of the original time series to plot in addition to the predictions.

• burn: The number of observations you wish to discard as burn-in from the posterior predictive distribution. This is in addition to the burn-in discarded using predict.bsts.

• median.color: The color to use for the posterior median of the prediction.

• median.type: The type of line (lty) to use for the posterior median of the prediction.

• median.width: The width of line (lwd) to use for the posterior median of the prediction.

• interval.quantiles: The lower and upper limits of the credible interval to be plotted.

• interval.color: The color to use for the upper and lower limits of the 95% credible interval for the prediction.

• interval.type: The type of line (lty) to use for the upper and lower limits of the 95% credible inerval for of the prediction.

• interval.width: The width of line (lwd) to use for the upper and lower limits of the 95% credible inerval for of the prediction.

• style: Either "dynamic", for dynamic distribution plots, or "boxplot", for box plots. Partial matching is allowed, so "dyn" or "box" would work, for example.

• ylim: Limits on the vertical axis.

• ...: Extra arguments to be passed to PlotDynamicDistribution

  and lines.

Details

Plots the posterior predictive distribution described by x using a dynamic distribution plot generated by PlotDynamicDistribution. Overlays the posterior median and 95% prediction limits for the predictive distribution.

Returns

Returns NULL.

Examples

data(AirPassengers)
  y <- log(AirPassengers)
  ss <- AddLocalLinearTrend(list(), y)
  ss <- AddSeasonal(ss, y, nseasons = 12)
  model <- bsts(y, state.specification = ss, niter = 500)
  pred <- predict(model, horizon = 12, burn = 100)
  plot(pred)

See Also

bsts

PlotDynamicDistribution

plot.lm.spike