PlotModelSize {BoomSpikeSlab}

Plot a distribution of model size

Description

Produces a histogram of number of nonzero coefficients in a spike-and-slab regression.

Usage

  PlotModelSize(beta, burn = 0, xlab= "Number of nonzero coefficients", ...)

Arguments

beta

A matrix of model coefficients. Each row represents an MCMC draw. Each column represents a coefficient for a variable.

burn

The number of MCMC iterations to be discarded as burn-in.

xlab

Label for the horizontal axis.

...

Additional arguments to be passed to hist

Value

Invisibly returns the vector of MCMC draws of model sizes.

Author(s)

Steven L. Scott

See Also

lm.spike plot.lm.spike

Examples

simulate.lm.spike <- function(n = 100, p = 10, ngood = 3, niter=1000, sigma = 8){
  x <- cbind(matrix(rnorm(n * (p-1)), nrow=n))
  beta <- c(rnorm(ngood), rep(0, p - ngood))
  y <- rnorm(n, beta[1] + x %*% beta[-1], sigma)
  draws <- lm.spike(y ~ x, niter=niter)
  return(invisible(draws))
}
model <- simulate.lm.spike(n = 1000, p = 50, sigma = .3)

# To get the plot of model size directly.
PlotModelSize(model$beta, burn = 10)

# Another way to get the same plot.
plot(model, "size", burn = 10)