SalmonLice: SalmonLice: Salmon Lice and Cleaner Fish

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

SalmonLice: Salmon Lice and Cleaner Fish

Description

This is simulated data. The density of salmon lice is measured as the average number of adult lice per fish in a fish cage (merd). There are six different farms and observations for eight fish cages in each of these farms. Lumpfish (rognkjeks in Norwegian) was used as cleaner fish in two farms and wrasses (leppefisk in Norwegian) was used in two farms. The remaining two farms was used as controls (i.e., no cleaner fish).

Usage

SalmonLice

Format

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

	Column name	Data type	Description	Values
[,1]	SalmonLice	numeric	Average number of lice in each cage	(0.1210 - 2.9538)
[,2]	Farm	factor	2 levels of farm	(Farm 1, Farm 2)
[,3]	CleanerFish	factor	2 types of cleaner fish	(Control, Lumpfish, Wrappers)

Note that: 'Farm1' under 'Lumpfish' is not the same farm as 'Farm1' under 'Wrappers' and 'Farm1' under control etc. Thus 6 different farms are represented.

Details

The parasite salmon lice is a large problem for salmon breeders. It has become a practice to use a biological method, so-called cleaner fish, to control the density of salmon lice in the farms. Cleaner fish are released into the cage along with, or a little time after, salmon is released into the cage. The number of lice was measured at a fixed time after releasing salmon into the cage.

This data was used for Exercise 3 in the Exam STAT210 (2019), and in Exercises for STAT210 (exercise 21) in August 2022.

Source

The data is created by Lars Erik Gangsei.

Examples

# A short summary of the variables
summary(SalmonLice)

# Linear model
lm(SalmonLice ~ CleanerFish, data = SalmonLice)

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