ISBN-13: 9780367342838, 978-0367342838. Statistics in Plain English Author(s): Timothy C. Urdan. Thoroughly updated throughout, this edition features several key additions and changes. First, a new chapter on person-centered analyses, including cluster analysis and latent class analysis (LCA) has been added, providing an important alternative to the more commonly used variable-centered analyses ([url] t tests, ANOVA, regression).