PredictorResponseUnivar function

Plot univariate predictor-response function on a new grid of points

PredictorResponseUnivar(
  fit,
  y = NULL,
  Z = NULL,
  X = NULL,
  which.z = 1:ncol(Z),
  method = "approx",
  ngrid = 50,
  q.fixed = 0.5,
  sel = NULL,
  min.plot.dist = Inf,
  center = TRUE,
  z.names = colnames(Z),
  ...
)

Arguments

• fit: An object containing the results returned by a the kmbayes function
• y: a vector of outcome data of length n.
• Z: an n-by-M matrix of predictor variables to be included in the h function. Each row represents an observation and each column represents an predictor.
• X: an n-by-K matrix of covariate data where each row represents an observation and each column represents a covariate. Should not contain an intercept column.
• which.z: vector identifying which predictors (columns of Z) should be plotted
• method: method for obtaining posterior summaries at a vector of new points. Options are "approx" and "exact"; defaults to "approx", which is faster particularly for large datasets; see details
• ngrid: number of grid points to cover the range of each predictor (column in Z)
• q.fixed: vector of quantiles at which to fix the remaining predictors in Z
• sel: logical expression indicating samples to keep; defaults to keeping the second half of all samples
• min.plot.dist: specifies a minimum distance that a new grid point needs to be from an observed data point in order to compute the prediction; points further than this will not be computed
• center: flag for whether to scale the exposure-response function to have mean zero
• z.names: optional vector of names for the columns of z
• ...: other arguments to pass on to the prediction function

Returns

a long data frame with the predictor name, predictor value, posterior mean estimate, and posterior standard deviation

Details

For guided examples, go to https://jenfb.github.io/bkmr/overview.html

Examples

## First generate dataset
set.seed(111)
dat <- SimData(n = 50, M = 4)
y <- dat$y
Z <- dat$Z
X <- dat$X

## Fit model with component-wise variable selection
## Using only 100 iterations to make example run quickly
## Typically should use a large number of iterations for inference
set.seed(111)
fitkm <- kmbayes(y = y, Z = Z, X = X, iter = 100, verbose = FALSE, varsel = TRUE)
pred.resp.univar <- PredictorResponseUnivar(fit = fitkm)