print.NBKP: Print Methods for NBKP Objects

In NBKP: Beta Kernel Process Modeling with Negative Binomial Response

Print Methods for NBKP Objects

Description

Provides formatted console output for fitted NBKP model objects and their predictions. The following specialized methods are supported:

• print.NBKP – display fitted NBKP model objects.

• print.predict_NBKP – display posterior predictive results.

Usage

## S3 method for class 'NBKP'
print(x, ...)

## S3 method for class 'predict_NBKP'
print(x, ...)

Arguments

x	An object of class "NBKP" or "predict_NBKP".
...	Additional arguments passed to the generic print method (currently unused; included for S3 consistency).

Value

Invisibly returns the input object. Called for the side effect of printing human-readable summaries to the console.

References

Zhao J, Qing K, Xu J (2025). BKP: An R Package for Beta Kernel Process Modeling. arXiv. https://doi.org/10.48550/arxiv.2508.10447.

See Also

fit_NBKP for model fitting; predict.NBKP for posterior prediction.

Examples

# -------------------------- 1D Example --------------------------
set.seed(123)

# Define true mean function
true_mu_fun <- function(x) {
  exp(sin(x) + 0.5)
}

n <- 30
Xbounds <- matrix(c(-2, 2), nrow=1)
X <- tgp::lhs(n = n, rect = Xbounds)
true_mu <- true_mu_fun(X)
y <- rnbinom(n, size = 1, mu = true_mu)

# Fit NBKP model
model1 <- fit_NBKP(X, y, Xbounds=Xbounds)
print(model1) # fitted object

pred1 <- predict(model1)
print(pred1) # predictions

# -------------------------- 2D Example --------------------------
set.seed(123)

# Define 2D latent function and mean transformation
true_mu_fun <- function(X) {
  if(is.null(nrow(X))) X <- matrix(X, nrow=1)
  x1 <- 4*X[,1] - 2
  x2 <- 4*X[,2] - 2
  f <- sin(2*pi*x1) * cos(2*pi*x2)
  return(exp(f))
}

n <- 100
Xbounds <- matrix(c(0, 0, 1, 1), nrow = 2)
X <- tgp::lhs(n = n, rect = Xbounds)
true_mu <- true_mu_fun(X)
y <- rnbinom(n, size = 0.5, mu = true_mu)

# Fit NBKP model
model2 <- fit_NBKP(X, y, Xbounds=Xbounds)
print(model2)

pred2 <- predict(model2)
print(pred2)

NBKP documentation built on June 18, 2026, 1:06 a.m.