darwin {bayesmix}

Differences in heights between plants

Description

A numeric vector containing 15 observations of differences in heights between pairs of self-fertilized and cross-fertilized plants grown in the same condition.

Usage

data(darwin)

Format

A numeric vector of length 15.

Details

Darwin's data set contains two extremely small values. Therefore, this data set can be used for outlier modelling.

Source

Abraham, B. and G. Box (1978) Linear models and spurious observations. Applied Statistics, 27, 131–8.

Examples

data("darwin", package = "bayesmix")
## Estimated sample density
plot(density(darwin[[1]]), ylim = c(0, 0.02), main = "Outlier modelling")
ss <- seq(-100, 100, by = 1)
## Normal density with estimated mean and sd of whole sample
lines(ss, dnorm(ss, mean = mean(darwin[[1]]), sd = sd(darwin[[1]])), col = "red")
## Normal density with estimated mean and sd of sample, where the 2
## extremely small values are removed
lines(ss, dnorm(ss, mean = mean(darwin[-c(1:2),1]),
      sd = sd(darwin[-c(1:2),1])), col = "green")