fish_age: Young fish in the North Sea.

In openintro: Datasets and Supplemental Functions from 'OpenIntro' Textbooks and Labs

Young fish in the North Sea.

Description

Samples of 50 Tobis fish, or Sand Eels, were collected at three different locations in the North Sea and the number of one-year-old fish were counted.

Usage

fish_age

Format

A data frame with 300 rows and 3 variables:

year

Year the fish was caught with levels 1997 and 1998.

location

Site the fish was caught with levels A, B and C.

one_year_old

Is the fish one-year-old, yes or no?

Source

Henrik Madsen, Paul Thyregod. 2011. Introduction to General and Generalized Linear Models CRC Press. Boca Raton, FL. ISBN: 978-1-4200-9155-7 Website

Examples

library(dplyr)
library(tidyr)

# Count the number of one-year-old fish at each location.

fish_age |>
  filter(one_year_old == "yes") |>
  count(year, location) |>
  pivot_wider(names_from = location, values_from = n)

openintro documentation built on June 22, 2024, 7:37 p.m.