birds.df: A Bird Data Set
In VGAMdata: Data Supporting the 'VGAM' Package

birds.df

R Documentation

A Bird Data Set

Description

An undocumented data set concerning birds.

Usage

data("birds.df")

Format

A data frame with 67 observations on the following 15 variables.

Species: a character vector
Status: a numeric vector
Length: a numeric vector
Mass: a numeric vector
Range: a numeric vector
Migr: a numeric vector
Insect: a numeric vector
Diet: a numeric vector
Clutch: a numeric vector
Broods: a numeric vector
Wood: a numeric vector
Upland: a numeric vector
Water: a numeric vector
Release: a numeric vector
Indiv: a numeric vector

Details

This is a data set used in a book (or in a draft version of a book). Unfortunately very few details seem available concerning the background and the variables. The purpose of its inclusion in VGAMdata is to show that a logistic regression applied to these data, mimicking the book, has estimates suffering from the Hauck–Donner effect (HDE; hdeff). It is called model.final in the book.

Source

http://rcompanion.org/documents/RCompanionBioStatistics.pdf, around pages 249–.

Examples

data(birds.df)
str(birds.df)

model.final.copy <-   # Try mimic the book example
  vglm(Status ~ Upland + Migr + Mass + Indiv + Insect + Wood,
       binomialff, data = birds.df, trace = TRUE)
summary(model.final.copy, hde.NA = FALSE)  # Wald table
hdeff(model.final.copy)
hdeff(model.final.copy, deriv = 2)

VGAMdata documentation built on April 3, 2025, 6:49 p.m.