In Reply: Dr Janosky correctly points out that
statistical power is a continuous quantity. Accepting the value of .80 as
adequate power is as arbitrary as accepting .05 to denote statistical significance.
Greater power and stricter standards for significance will always be preferable,
but one is always obtained at the cost of the other. Our experience has been
that many peer reviewers still adhere to a dichotomy based on 80% or 90% power.
However, no numerical value for power will be adequate if it is generated
without carefully considering the size of the clinically important effect.
The 3-tiered model we propose may help investigators determine such effects
and calculate their power accordingly.
Register and get free email Table of Contents alerts, saved searches, PowerPoint downloads, CME quizzes, and more
Subscribe for full-text access to content from 1998 forward and a host of useful features
Activate your current subscription (AMA members and current subscribers)
Purchase Online Access to this article for 24 hours
Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature
Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal
Some tools below are only available to our subscribers or users with an online account.
Download citation file:
Web of Science® Times Cited: 9
Customize your page view by dragging & repositioning the boxes below.
More Listings atJAMACareerCenter.com >
and access these and other features:
Enter your username and email address. We'll send you a link to reset your password.
Enter your username and email address. We'll send instructions on how to reset your password to the email address we have on record.
Athens and Shibboleth are access management services that provide single sign-on to protected resources. They replace the multiple user names and passwords necessary to access subscription-based content with a single user name and password that can be entered once per session. It operates independently of a user's location or IP address. If your institution uses Athens or Shibboleth authentication, please contact your site administrator to receive your user name and password.