dice (version 1.2)

dice-package: Calculate probabilities of various dice-rolling events

Description

This package provides utilities to calculate the probabilities of various dice-rolling events, such as the probability of rolling a four-sided die six times and getting a 4, a 3, and either a 1 or 2 among the six rolls (in any order); the probability of rolling two six-sided dice three times and getting a 10 on the first roll, followed by a 4 on the second roll, followed by anything but a 7 on the third roll; or the probabilities of each possible sum of rolling five six-sided dice, dropping the lowest two rolls, and summing the remaining dice.

Details

Package:

dice

Type:

Package

Version:

1.2

Date:

2014-10-13

License:

GPL (>= 2)

Although initially conceived as a utility for role-playing game calculations, functions in the dice package can be used to answer questions in any dice-rolling context (e.g., calculating probabilities for the game of craps, solving problems for an introductory probability course, etc.)

The dice package requires the gtools package.

For a complete list of functions, use library(help="dice").

References

The implementation for the getSumProbs function originated with the ideas presented in the following forum thread:

http://www.enworld.org/showthread.php?t=56352&page=1&pp=40

Examples

getEventProb(nrolls = 6,
             ndicePerRoll = 1,
             nsidesPerDie = 4,
             eventList = list(4, 3, c(1,2)),
             orderMatters = FALSE)

getEventProb(nrolls = 3,
             ndicePerRoll = 2,
             nsidesPerDie = 6,
             eventList = list(10, 4, c(2:6, 8:12)),
             orderMatters = TRUE)

getSumProbs(ndicePerRoll = 5,
            nsidesPerDie = 6,
            nkept = 3,
            dropLowest = TRUE)