discreteRV (version 1.2.2)

RV: Make a random variable consisting of possible outcome values and their probabilities or odds

Description

Make a random variable consisting of possible outcome values and their probabilities or odds

Usage

RV(outcomes, probs = NULL, odds = NULL, fractions = (class(probs) != "function"), range = any(is.infinite(outcomes)), verifyprobs = TRUE, id = rnorm(1), ...)

Arguments

outcomes

Vector of possible outcomes

probs

Vector of probabilities or function defining probabilities

odds

Vector of odds

fractions

If TRUE, return the probabilities as fractions when printing

range

If TRUE, outcomes specify a range of values in the form c(lower, upper)

verifyprobs

If TRUE, verify that the probs sum to one

id

Set the id of the random variable

...

Additional parameters passed to the function defining outcome probabilities

Value

random variable as RV object.

Examples

# Make a 50:50 Bernoulli random variable:
X.Bern <- RV(c(1,0), c(.5,.5))

# An equivalent method
X.Bern <- RV("bernoulli")

# Make a fair coin flip game with payoffs +$1 and -$1:
X.fair.coin <- RV(c(1,-1), c(.5,.5))

# Make a biased coin flip game with odds 1:2 and with fair payoffs +$2 and -$1
X.biased.coin <- RV(c(2,-1), odds = c(1,2))

# Make a fair die
X.fair.die <- RV(1:6, 1/6)

# Make a loaded die, specifying odds 1:1:1:1:2:4 rather than probabilities:
X.loaded.die <- RV(1:6, odds = c(1,1,1,1,2,4))

# Make a Poisson random variable
pois.func <- function(x, lambda) { lambda^x * exp(-lambda) / factorial(x) }
X.pois <- RV(c(0, Inf), pois.func, lambda = 5)

# An equivalent method
X.pois <- RV("poisson")