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posted by John Lott at 2:20 PM 1 comments
We conducted replications of 100 experimental and correlational studies published in three psychology journals using high-powered designs and original materials when available. There is no single standard for evaluating replication success. Here, we evaluated reproducibility using significance and P values, effect sizes, subjective assessments of replication teams, and meta-analysis of effect sizes. The mean effect size (r) of the replication effects (Mr = 0.197, SD = 0.257) was half the magnitude of the mean effect size of the original effects (Mr = 0.403, SD = 0.188), representing a substantial decline. Ninety-seven percent of original studies had significant results (P < .05). Thirty-six percent of replications had significant results; 47% of original effect sizes were in the 95% confidence interval of the replication effect size; 39% of effects were subjectively rated to have replicated the original result . . . .It isn't clear what "subjectively rated" means, but it raises the question of whether people are making their results look more significant that they actually were. However, this should just be the start of doing replications.
Labels: psychology
posted by John Lott at 1:22 PM 0 comments
My commentary on a broad array of economics and crime related issues.
Dumbing Down the Courts: How Politics Keeps the Smartest Judges Off the Bench
Straight Shooting: Firearms, Economics and Public Policy
Are Predatory Commitments Credible? Who Should the Courts Believe?
-Research finding a drop in violent crime rates from Right-to-carry laws
-Ranking Economists
-Interview with the Washington Post
-Debate on "Guns Reduce Crime"
-Appalachian law school attack
-Sources for Defensive Gun Uses
-The Merced Pitchfork Killings
-Fraudulent website pretending to be run by me
-Steve Levitt's Correction Letter
-Ian Ayres and John Donohue
-Other issues regarding Steve Levitt
-National Academies of Science Panel on Firearms
-Baghdad murder rate
-Arming Pilots
-General discussion of my 1997 and 2002 surveys as well as related surveys
-Problems with Wikipedia
-Errata for Gun Books
-US Supreme Court Wire
-Futures for Financial Markets
-judgepedia
Economist and Law Professor David D. Friedman's Blog
Larry Elder's The Elder Statement
Economist Robert G. Hansen's Blog
Firearmstruth.com -- a media-watchdog website
A debate that I had with George Mason University's Robert Ehrlich on guns
Lyonette Louis-Jacques's page on Firearms Regulation Worldwide
An interview concerning More Guns, Less Crime: Understanding Crime and Gun Control Laws
The End of Myth: An Interview with Dr. John Lott
Art DeVany's website, one of the more innovative economists in the last few decades
St. Cloud State University Scholars
Bryan Caplan at George Mason University
Alphecca -- weekly review on the media's coverage of guns
Xrlq -- Some interesting coverage of the law.
Career Police Officer
Gun Law News
Georgia Right-to-Carry
Darnell's The Independent Conservative Blog
Robert Stacy McCain's Blog
Clayton Cramer's Blog
My hidden mathematical ability (a math professor with the same name)
geekwitha45
My Old AEI Web Page
Wrightwing's blog
Al Lowe's blog
St. Maximos' Hut
Dad29
Elizabeth Blackney's blog
Eric Rasmusen
Your "Economics" Portal to the World by Larry Low
William Sjostrom
Dr. T's EconLinks.com
Interview with National Review Online
Blog at Newsmax.com
Pieces I have written at BigGovernment.com
Updated Media Analysis of Appalachian Law School Attack
Journal of Legal Studies paper on spoiled ballots during the 2000 Presidential Election
Data set from USA Today, STATA 7.0 data set
"Do" File for some of the basic regressions from the paper