Allergy: Allergy Data Set

In gpk: 100 Data Sets for Statistics Education

Description

Cosmetic products can cause allergenic response in users. Such a development can do significant harm to the name of its producer. Hence it is routine to carry out safety tests. In a study to compare irritability of 4 products, seven individuals were asked to apply each product on forearm. Higher the irritation score worse is the product.

Warning: since observations on the same individual are correlated, use of ANOVA may not be valid.

Usage

data(Allergy)

Format

A data frame with 7 observations on the following 4 variables.

ProdA

Irritation score for product A

ProdB

Irritation score for product B

ProdC

Irritation score for product C

ProdD

Irritation score for product D

Details

Cosmetic products can cause allergenic response in users. Such a development can do significant harm to the name of its producer. Hence it is routine to carry out safety tests. In a study to compare irritability of 4 products, seven individuals were asked to apply each product on forearm. Higher the irritation score worse is the product. Warning: since observations on the same individual are correlated, use of ANOVA may not be valid.

Source

http://ces.iisc.ernet.in/hpg/nvjoshi/statspunedatabook/databook.html

Examples

data(Allergy)
friedman.test(as.matrix(Allergy))

Example output

	Friedman rank sum test

data:  as.matrix(Allergy)
Friedman chi-squared = 5.5714, df = 3, p-value = 0.1344

gpk documentation built on May 2, 2019, 12:39 p.m.