Search Results for Tag: Statistics

Mind the Confidence Interval!

“Most patients using the new analgesia reported significantly reduced pain.” Such research findings sound exciting because the word significant suggests important and large. But researchers often use the word with a narrow statistical meaning that has nothing to do with importance. Consider this statement – a change is statistically significant if we are unlikely to […]

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A Primer on p Hacking

  There is a replicability crisis in science – unidentified “false positives” are pervading even our top research journals. A false positive is a claim that an effect exists when in actuality it doesn’t. No one knows what proportion of published papers contain such incorrect or overstated results, but there are signs that the proportion […]

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Free Chapter From Andy Field’s New Statistics Book

Will Zach find Alice, the missing love of his life, and save the world? Will he survive the bridge of death? Can he escape the zombie horde? Statistically speaking the odds don’t look good … Award-winning teacher and bestselling author Andy Field hasn’t just broken the traditional textbook mold with his new, stunningly illustrated introduction […]

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Statistical Association Takes on Use, Abuse of P-values

Even as it insists it’s not really saying anything new, the American Statistical Association Board of Directors has laid down a marker in the debate over what constitutes “statistical significance.” After months of discussion with a blue-chip panel of experts, the association has laid down six principles about what constitutes good practice when dealing with […]

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Focusing on Average Treatment Impacts May Underestimate Program Impacts

This post is based on the article “Reconsidering findings of “no effects” in randomized control trials: Modeling differences in treatment impacts” by Brad Chaney. The article appears online at the American Journal of Evaluation. When impacts vary from one subgroup to another, then focusing on average treatment effects (ATEs) may underestimate the impacts, according to […]

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Statistics” Crisis of Reproducibility

The past and future collided last year for the International Year of Statistics, when six professional organizations celebrated the multifaceted role of statistics in contemporary society to raise public awareness of statistics, and to promote thinking about the future of the discipline. The past came in the form of the 300th anniversary of Jacob Bernoulli’s Ars conjectandi (Art […]

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Not Reading Your Stats Textbook? Award-Nominated Online Book Knows and Tells

UPDATE: Gregory Francis’s IntroStats Online did win the Software & Information Industry Association’s 2014 CODiE Award for Best Social Sciences Instructional Solution. For a full list of award winners, visit http://www.siia.net/codies/2014/winners.asp.   *** Statistics can be a hard slog for the students taking their first, and sometimes only, jaunt through this quantitative minefield. But an […]

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”Most Promising New Textbook” author shares insights on behavioral research methods

Research Methods for the Behavioral Sciences, by psychologist Gregory J. Privitera, has been honored by the Text and Academic Authors Association with a 2014 Most Promising New Textbook Award, dubbed a Texty. The award category was created in 2012 to recognize current textbooks and learning materials that are still in their first editions. Judges are […]

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SPSS is not dead

This blog was published recently showing that the use of R continues to grow in academia. One of the graphs (Figure 1) showed citations (using google scholar) of different statistical packages in academic papers (to which I have added annotations). Figure 1: Citations of stats packages (from http://blog.revolutionanalytics.com/2012/04/rs-continued-growth-in-academia.html)   At face value, this graph implies […]

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Newspapers and 7 Core Statistical Concepts

There have been a few news stories recently about misunderstanding of statistics; especially confusing correlation with cause. For example, the Guardian ran this story/tutorial (http://t.co/AwCugVIV). Hot on the heels of that useful reminder, came a story linking unemployment in the UK to immigration from outside of the EU (http://t.co/7rTcFvbH). By the time the Daily Mail […]

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