Alpha level is the odds a researcher is willing to take to commit a Type I error
In instances where Type I or false positive findings are deleterious to patients, a small alpha level such as .01 or .001 can be chosen. This makes significant treatment effects much harder to detect. With these alpha levels, researchers take on the risks of 1 in 100 and 1 in 1,000, respectively, of committing a Type I error.
When multiple hypotheses are tested concurrently, such as when multiple statistical tests are run at the same time using the same statistical test, the chances of committing a Type I error increase DRASTICALLY. If you were to test five hypotheses using an alpha value of .05, then the odds of committing a Type I error increase to 5 in 20 or 25%. This phenomenon is often accounted for using a Bonferonni corrected alpha value to be used for significance. Simply divide the alpha level by the number of hypotheses being tested to yield the new alpha level that needs to be achieved to denote statistical significance. For example, .05 / 5 = .01. So, when testing my five hypotheses, unless the test statistic falls in the critical area outside of .01, it is not statistically significant.
Statistician Services for Students
Eric Heidel, Ph.D. will provide the following services for undergraduate and graduate students at $50/hour. Secure checkout is available with Stripe or PayPal.
- Statistical Analysis
- Research Design
- Sample Size Calculations
- Diagnostic Testing and Epidemiological Calculations
- Survey Design and Psychometrics
AppNotch: Convert this website into an Android and iOS app.
AppNotch team will notify you when your app gets approved in Google Play and Apple iTunes App Stores. Once your app goes live, enter your App Store URLs in this property window, publish your Weebly site and your app store icons will be visible in this page.
Please visit AppNotch.com FAQ to learn more about how to add App Store icons to your website, update your app, send Push notifications and more.
Professional Statistician For Hire!
Copyright © 2019 Scalë. All Rights Reserved. Patent Pending.