1 Introduction

1.1 Intro

1.2 Aim of this book

  • The intended use of this text is to introduce the most useful types of statistical analysis including linear models and their generalized linear model (GLM) extensions
  • The approach is to learn by doing using real datasets relating to biological and environmental sciences

1.3 Changes in the second edition

1.4 The R programming language for statistics and graphics

1.5 Scope

  • The focus is on linear model framework since this applies to biological sciences well
  • GLMs are introduced for non-normal distributions

1.6 What is not covered

  • Non-linear regression approaches, generalized additive models, non-parametric approaches

1.7 The approach

  • Most of the methods in this text belong to the ‘classist frequentist statistics’
  • This approach has come under scrutiny due to its reliance on probability (p) values and lowered emphasis on effect sizes (estimates and intervals)
  • The author is also pretty vocal about this criticism so he uses estimation-based approaches that focuses on estimates and confidence intervals where possible
  • He also uses a priori contrasts (comparisons that were planned in advance) and encourages avoidiing the inappropriate overuse of multiple testing and instead to implement a more thoughtful/planned approach

1.8 The new statistics?

  • This term basically refers to the criticisms mentioned in the last section and the recent focus on the use of confidence intervals and estimates
  • This is combined with the use of the modern maximum likelihood-based analysis and methods for reproducible research

1.9 Getting started

  • There is an introduction to R section at the end of the text
  • The author dives right into things in the next chapter