To the Editor: In their study of hair mineral analysis by commercial laboratories, Dr Seidel and colleagues1 erroneously claim to have examined the "reliability" of hair mineral analysis. We also believe that the authors have misinterpreted the hypothesis they set out to test.
The reliability of an analytical procedure cannot be assessed by supplying a portion of the same sample to several laboratories. The reliability of data can be determined only from calculation of the coefficient of variation of repeated analyses of portions of the same sample within the same laboratory. Only then could the accuracy and reliability of the data from different laboratories be compared to identify those that are most accurate and reliable. Such a calculation is impossible from the design of this study. Furthermore, the lack of any other objective data concerning the mineral and trace element content of the submitted sample precludes any conclusions about the accuracy of any of the test results. The authors seem to advocate accuracy through consensus and then express dissatisfaction with the degree of consensus they obtained.
Some tools below are only available to our subscribers or users with an online account.
Download citation file:
Web of Science® Times Cited: 1
Customize your page view by dragging & repositioning the boxes below.
More Listings atJAMACareerCenter.com >
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.