Time Series, Health & Evidence Synthesis · Biostatistics & Clinical Trials

Advanced Biostatistics · Regression Models for Non-Normal Response Variables

Public introduction · full guide in Eikos

Introduction

What this guide covers

In the biomedical and health sciences, response variables of clinical interest rarely satisfy the assumptions of normality and homoscedasticity required by the classical linear model estimated via ordinary least squares (OLS). Treatment success or failure (binary), bacterial colony counts or seizure episodes (counts), hospital cost or time to an event represent typical examples.

Overview

Topics covered

  • Introduction
  • Regression Models for Non-Normal Response Variables
  • Limits of the classical linear model in biomedicine
  • The Exponential Dispersion Family
  • Architecture of Generalized Linear Models (GLM)
  • 1. The random component

Related concepts

Main connections

  • Variance & standard deviation
  • Mean & expected value
  • Maximum likelihood estimation
  • Poisson distribution
  • Logistic regression
  • Binomial distribution

Compatible notation

Mathematical sample in LaTeX

The expression is rendered accessibly, with its LaTeX source preserved below.

Yi=𝐱iT𝛃+εi,εi∼i.i.d.𝒩(0,σ2)
View LaTeX sourceY_i = \mathbf{x}_i^T \boldsymbol{\beta} + \varepsilon_i, \qquad \varepsilon_i \stackrel{\text{i.i.d.}}{\sim} \mathcal{N}(0, \sigma^2)