ucarprice

Prices of used cars and variables describing the cars.

datasets

A model of the form Y = f(x) + s(x) Z is fit where functions f and s are modeled with ensembles of trees and Z is standard normal.
This model is developed in the paper 'Heteroscedastic BART Via Multiplicative Regression Trees'
(Pratola, Chipman, George, and McCulloch, 2019, <arXiv:1709.07542v2>).
BART refers to Bayesian Additive Regression Trees. See the R-package 'BART'.
The predictor vector x may be high dimensional.
A Markov Chain Monte Carlo (MCMC) algorithm provides Bayesian posterior uncertainty for both f and s.
The MCMC uses the recent innovations in
Efficient Metropolis--Hastings proposal mechanisms for Bayesian regression tree models
(Pratola, 2015, Bayesian Analysis, <doi:10.1214/16-BA999>).

Robert McCulloch

rbart

Bayesian Trees for Conditional Mean and Variance

Matthew Pratola

Hugh Chipman

ucarprice function

A data frame with 1,000 observations on the following 7 variables.<dl class="dl-horizontal">
 <dt><code>price</code></dt><dd>numeric: price of a car in dollars</dd>
 <dt><code>trim</code></dt><dd>factor: trim of the car, for example, how the interior is styled</dd>
 <dt><code>isOneOwner</code></dt><dd>factor: has the car had just one owner, t=yes, f=no</dd>
 <dt><code>mileage</code></dt><dd>numeric: number of miles the car has been driven</dd>
 <dt><code>year</code></dt><dd>numeric: model year of the car</dd>
 <dt><code>color</code></dt><dd>factor: color of the car</dd>
 <dt><code>displacement</code></dt><dd>factor: displacement of the car engine</dd>
 </dl>

Format

Used Car Prices — ucarprice

A data frame with 1,000 observations on the following 7 variables.<dl class='dl-horizontal'>
 <dt><code>price</code></dt><dd>numeric: price of a car in dollars</dd>
 <dt><code>trim</code></dt><dd>factor: trim of the car, for example, how the interior is styled</dd>
 <dt><code>isOneOwner</code></dt><dd>factor: has the car had just one owner, t=yes, f=no</dd>
 <dt><code>mileage</code></dt><dd>numeric: number of miles the car has been driven</dd>
 <dt><code>year</code></dt><dd>numeric: model year of the car</dd>
 <dt><code>color</code></dt><dd>factor: color of the car</dd>
 <dt><code>displacement</code></dt><dd>factor: displacement of the car engine</dd>
 </dl>

ucarprice: Used Car Prices

Description

Usage

Arguments

Format

Examples