ddesire: Generic Distribution functions for desirabilities

Description Usage Arguments Value Note Author(s) See Also Examples

View source: R/dfun.R

Description

Generic density, distribution, quantile and random number generation functions for desirability functions.

Usage

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## Default S3 method:
ddesire(x, f, mean = 0, sd = 1)
## Default S3 method:
pdesire(q, f, mean = 0, sd = 1)
## Default S3 method:
qdesire(p, f, mean = 0, sd = 1)
## Default S3 method:
rdesire(n, f, mean = 0, sd = 1)
## Default S3 method:
edesire(f, mean, sd)
## Default S3 method:
vdesire(f, mean, sd)

Arguments

x,q

Vector of quantiles.

p

vector of probabilies.

n

number of observations.

f

desirability function

mean

vector of means.

sd

vector of standard deviations.

Value

'ddesire' gives the density, 'pdesire' gives the distribution function, 'qdesire' gives the quantile function, and 'rdesire' generates random deviates.

'edesire' and 'vdesire' return the expectation and variance of the function.

Note

The default implementations for pdesire, qdesire, edesire and vdesire are only approximations obtained by estimating the desired property from a random sample.

Author(s)

Heike Trautmann [email protected], Detlef Steuer [email protected] and Olaf Mersmann [email protected]

See Also

For desirability functions: harrington1 and harrington2

Examples

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data(Chocolate)

## Fit linear model to data:
m.d90 <- lm(d90 ~ rt + as + I(rt^2) + I(as^2) + rt:as, Chocolate)
m.Fe <- lm(Fe ~ rt + as + I(rt^2) + I(as^2) + rt:as, Chocolate)

## Define desirability functions:
d.d90 <- harrington2(21, 22, 1)
d.Fe <- harrington1(22, 0.8, 28, 0.2)

## Plot density of desirability in rt=30, as=50:
df <- data.frame(rt=30, as=50)
y.Fe <- predict(m.Fe, df)
sigma.Fe <- summary(m.Fe)$sigma

y.d90 <- predict(m.d90, df)
sigma.d90 <- summary(m.d90)$sigma

## Plot curve of density function:
opar <- par(mfrow=c(2,1))
curve(ddesire(x, d.d90, y.d90, sigma.d90), 0, 1, main="d.90", n=202)
curve(ddesire(x, d.Fe, y.Fe, sigma.Fe), 0, 1, main="Fe", n=202)
par(opar)

## Integrate:
integrate(function(x) ddesire(x, d.d90, y.d90, sigma.d90), 0, 1)
integrate(function(x) ddesire(x, d.Fe, y.Fe, sigma.Fe), 0, 1)

desire documentation built on May 31, 2017, 4:06 a.m.

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