1、 ANSI/CTA Standard Physical Activity Monitoring for Fitness Wearables: Step Counting ANSI/CTA-2056 October 2016 NOTICE Consumer Technology Association (CTA) Standards, Bulletins and other technical publications are designed to serve the public interest through eliminating misunderstandings between m
2、anufacturers and purchasers, facilitating interchangeability and improvement of products, and assisting the purchaser in selecting and obtaining with minimum delay the proper product for his particular need. Existence of such Standards, Bulletins and other technical publications shall not in any res
3、pect preclude any member or nonmember of the Consumer Technology Association from manufacturing or selling products not conforming to such Standards, Bulletins or other technical publications, nor shall the existence of such Standards, Bulletins and other technical publications preclude their volunt
4、ary use by those other than Consumer Technology Association members, whether the standard is to be used either domestically or internationally. Standards, Bulletins and other technical publications are adopted by the Consumer Technology Association in accordance with the American National Standards
5、Institute (ANSI) patent policy. By such action, the Consumer Technology Association does not assume any liability to any patent owner, nor does it assume any obligation whatever to parties adopting the Standard, Bulletin or other technical publication. This document does not purport to address all s
6、afety problems associated with its use or all applicable regulatory requirements. It is the responsibility of the user of this document to establish appropriate safety and health practices and to determine the applicability of regulatory limitations before its use. This document is copyrighted by th
7、e Consumer Technology Association (CTA) and may not be reproduced, in whole or part, without written permission. Federal copyright law prohibits unauthorized reproduction of this document by any means. Organizations may obtain permission to reproduce a limited number of copies by entering into a lic
8、ense agreement. Requests to reproduce text, data, charts, figures or other material should be made to the Consumer Technology Association (CTA). (Formulated under the cognizance of the CTA R6.4 Health 2. Manual counted Steps from video per Participant; and 3. Step count accuracy, calculated using th
9、e formula in Section 6.1 separately for both Walking and Jogging/Running for each device. 6.1 Step Count Accuracy Calculate Mean absolute percentage error (MAPE) for each Physical Monitoring Device, separately for Walking and for Jogging/Running. The MAPE is defined by the formula below. n MAPE = (1
10、00/n) x | (Ti Ei) / Ti | i=1 Mean absolute percentage error is a quantity used to measure how close an estimate is to the true value. Where Ti is the true value (obtained from the manual Step count from the video for each Participant) and Ei is the estimate value (obtained from the Step count on the
11、 Physical Monitoring Device for each Participant), and n is the number of estimate values (i.e., count of tests performed for the Walking and Jogging/Running categories respectively). Consumer Technology Association Document Improvement Proposal If in the review or use of this document a potential change is made evident for safety, health or technical reasons, please email your reason/rationale for the recommended change to standardsce.org. Consumer Technology Association Technology & Standards Department 1919 S Eads Street, Arlington, VA 22202 FAX: (703) 907-7693 standardsce.org
