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ERIC Number: EJ870156
Record Type: Journal
Publication Date: 2009-Jun
Pages: 7
Abstractor: As Provided
Reference Count: 31
ISSN: ISSN-0270-1367
Individual Information-Centered Approach for Handling Physical Activity Missing Data
Kang, Minsoo; Rowe, David A.; Barreira, Tiago V.; Robinson, Terrance S.; Mahar, Matthew T.
Research Quarterly for Exercise and Sport, v80 n2 p131-137 Jun 2009
The purpose of this study was to validate individual information (II)-centered methods for handling missing data, using data samples of 118 middle-aged adults and 91 older adults equipped with Yamax SW-200 pedometers and Actigraph accelerometers for 7 days. We used a semisimulation approach to create six data sets: three physical activity outcome measurements (i.e., step counts, activity counts, and minutes of moderate to vigorous physical activity) for both groups (i.e., middle-aged adults and older adults). After analyzing each data set separately, we replaced missing values with two II-centered and two group information (GI)-centered methods. Root mean square difference (RMSD), mean signed difference, paired t tests, and Pearson correlations were used to determine the effectiveness of the various recovery methods. Overall, the II-centered methods showed smaller RMSDs than the GI-centered methods for each data set in both groups. We found no significant mean differences between the known values and the replacement values in all conditions. The II-centered methods produced better results than GI-centered methods. We determined substituting missing data points using the average of days remaining to be an accurate missing data recovery method for middle-aged adults' and older adults' pedometer and accelerometer data. (Contains 5 tables.)
American Alliance for Health, Physical Education, Recreation and Dance. 1900 Association Drive, Reston, VA 20191. Tel: 800-213-7193; Fax: 703-476-9527; e-mail:; Web site:
Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Identifiers - Location: North Carolina; West Virginia