ListeriaStore: ListeriaStore: Listeria in Ham

In thoree/stat340: Data and functions for BIAS at NMBU

ListeriaStore: Listeria in Ham

Description

This is simulated data based on real experiments by Animalia AS (to mimic realistic variance). The density of the bacterial genus Listeria was measured on six brands of ham from different grocery stores. The measurements were done on cold cuts of ham and by counting the number of colony-forming units per gram.

Usage

ListeriaStore

Format

A data frame with 48 observations (rows) and 3 variables (columns).

	Column name	Data type	Description	Values
[,1]	ListeriaNumber	numeric	Listeria density in cfu/g	(635.3076 - 15994102)
[,2]	HamTopping	factor	6 brands of ham	(HamT1...HamT6)
[,3]	GroceryStore	factor	4 different stores	(Store1...Store4)

Details

Cold cuts of ham are available in a large number of brands, differing slightly in thickness, packing method, producers, addings etc. A research group wanted to test the hypothesis if the brand of cold cuts of ham had any effect on Listeria growth. They soon realized that they could not test all brands. Thus, they randomly picked 6 brands of cold cuts of ham and for those 6 brands they randomly picked 8 replicates. These replicates were picked in 4 different grocery stores, 2 replicates for each brand in each store.

This data was used for compulsory assignment in STAT210 H20, and in Exercises for STAT210 (exercise 20) in August 2022.

Source

The data is created by Lars Erik Gangsei.

Examples

# First six rows
head(ListeriaStore)

# Linear model
lm(ListeriaNumber ~ HamTopping, data = ListeriaStore)

thoree/stat340 documentation built on June 30, 2024, 4:04 p.m.