Roacheggs: Oriental Cockroaches

In PASWR: Probability and Statistics with R

Oriental Cockroaches

Description

A laboratory is interested in testing a new child friendly pesticide on Blatta orientalis (oriental cockroaches). Scientists apply the new pesticide to 81 randomly selected Blatta orientalis oothecae (eggs). The results from the experiment are stored in the data frame Roacheggs in the variable eggs. A zero in the variable eggs indicates that nothing hatched from the egg while a 1 indicates the birth of a cockroach. Data is used in Example 7.16.

Format

A data frame with 81 observations on the following variable:

eggs

numeric vector where a 0 indicates nothing hatched while a 1 indicates the birth of a cockroach.

Source

Ugarte, M. D., Militino, A. F., and Arnholt, A. T. (2008) Probability and Statistics with R. Chapman & Hall/CRC.

Examples

p <- seq(0.1, 0.9, 0.001)
negloglike <- function(p){
-(sum(Roacheggs$eggs)*log(p) + sum(1 - Roacheggs$eggs)*log(1 - p))
}
nlm(negloglike, 0.2)
rm(negloglike)

PASWR documentation built on May 15, 2022, 5:05 p.m.