simDat63: Simulate data for Chapter 6.3: Two groups with unequal...

In ASMbook: Functions for the Book "Applied Statistical Modeling for Ecologists"

Simulate data for Chapter 6.3: Two groups with unequal variance

Description

Simulate wingspan measurements in female and male peregrines with unequal variance.

Usage

simDat63(n1 = 60, n2 = 40, mu1 = 105, mu2 = 77.5, sigma1 = 3, sigma2 = 2.5)

Arguments

n1	The sample size of females
n2	The sample size of males
mu1	The population mean males
mu2	The population mean females
sigma1	The standard deviation for females
sigma2	The standard deviation for males

Value

A list of simulated data and parameters.

n1	Female sample size
n2	Male sample size
mu1	Female mean
mu2	Male mean
beta	Difference in wingspan mean between sexes
sigma1	Standard deviation for females
sigma2	Standard deviation for males
x	Indicator variable for sex, 1 = male
y	Simulated wingspan data

Author(s)

Marc Kéry

Examples

str(dat <- simDat63())            # Implicit default arguments
str(dat <- simDat63(sigma1 = 5, sigma2 = 1)) # Very unequal variances

# Much larger sample sizes and larger difference in residual variation
str(dat <- simDat63(n1 = 10000, n2 = 10000, sigma1 = 5, sigma2 = 2))

# Revert to model with homoscedasticity
str(dat <- simDat63(n1 = 10000, n2 = 10000, sigma1 = 5, sigma2 = 5))

# Revert to "model-of-the-mean" (with larger sample size)
str(dat <- simDat63(n1 = 10000, n2 = 10000, mu1 = 105, mu2 = 105, sigma1 = 5, sigma2 = 5))

ASMbook documentation built on Sept. 11, 2024, 5:38 p.m.