Many problems in biology require an understanding of the relationships among variables in a multivariate causal context. Exploring such cause-effect relationships through a series of statistical methods, this book explains how to test causal hypotheses when randomised experiments cannot be performed. This completely revised and updated edition features detailed explanations for carrying out statistical methods using the popular and freely available R statistical language. Sections on d-sep tests, latent constructs that are common in biology, missing values, phylogenetic constraints, and multilevel models are also an important feature of this new edition. Written for biologists and using a minimum of statistical jargon, the concept of testing multivariate causal hypotheses using structural equations and path analysis is demystified. Assuming only a basic understanding of statistical analysis, this new edition is a valuable resource for both students and practising biologists.
This book goes beyond the truism that 'correlation does not imply causation' and explores the logical and methodological relationships between correlation and causation. It presents a series of statistical methods that can test, and potentially discover, cause-effect relationships between variables in situations in which it is not possible to conduct randomised or experimentally controlled experiments. Many of these methods are quite new and most are generally unknown to biologists. In addition to describing how to conduct these statistical tests, the book also puts the methods into historical context and explains when they can and cannot justifiably be used to test or discover causal claims. Written in a conversational style that minimises technical jargon, the book is aimed at practising biologists and advanced students, and assumes only a very basic knowledge of introductory statistics.
One life ended in tragedy. Another challenged by a promise. Will a teen's twenty-year journey to make his dad proud change him into the man he's meant to be? In 1966, Jim Pepperman comes home from practice to the news that his dad has died in an oil rig accident. Not only has the high school football star lost his mentor and best friend, but when his mom moves the family from Texas to New Jersey, he's forced to say goodbye to his home, his team, and his chance for a football scholarship. Facing senior year in a new school with no friends, Jim struggles to keep the promise he made after his dad died to be a substitute father for his two younger sisters and a shoulder for his mom. But stepping into his dad's shoes at seventeen feels impossible, the same way giving up the dream to play pro ball is harder than Jim thought. And senior year is just the beginning.
An evil presence looms over the desert community. Native American legend calls it Tahquitz. The new casino operators call it an opportunity to make money … Young Luke Kauffmann acquires a pair of strange goggles that gives him glimpses into dimensions around him, where dark, sinister forces exert their powers to influence—and glimmering creatures of light strive to stop them. Thanks to the help of a beautiful but quirky techie, Luke increases the power of the goggles until he is thrust even deeper into the spirit world. With their added strength and the help of others, darker secrets are soon uncovered until Luke himself is seduced by the power and pride that the goggles offer. It isn’t until the final showdown at Tahquitz’s very lair that Luke and his colleagues learn the deeper truths of spiritual warfare that enable them to destroy the creature’s sinister hold upon the valley. Award-winning novelist Bill Myers delivers another breathtaking supernatural thriller full of unforgettable characters, unequalled imagination, and thought-provoking issues. The Seeing is Book Three in the Soul Tracker series, which also includes Soul Tracker and The Presence. Also available: unabridged audio CD edition.
Makes charges about how politicians, the clergy, and families are failing to protect those in their care, presenting strong statements about personal responsibility and self-reliance in today's uncertain world.
In Game of My Life Texas Longhorns, prominent Texas players of the past and coach Darrell Royal share their fondest experiences and game-day memories of the games they remember the most, largely in their own words, with authors Michael Pearle and Bill Frisbie. Longhorn greats take the reader on a journey back to some of the greatest games in Texas history. How did Earl Campbell prove that he was worthy of the Heisman? How did a Snickers bar help convince Ricky Williams to return to Texas for his senior year? What was Vince Young really thinking just before the 2006 Rose Bowl? In Game of My Life Texas Longhorns, fans will find the answers to these questions and many more as more than twenty of the greatest players relive the moment that shaped their college football career. Within these pages, Texas fans will finally get the chance to step into the game and onto the grass with their favorite Longhorns legends. UT grads Michael Pearle and Bill Frisbie walk readers down memory lane to capture some of the most exciting, poignant, and fulfilling games ever played by the Horns. A must-have for any Horns fan.
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