Individual Information-Centered Approach for Handling Physical Activity Missing Data
Individual Information-Centered Approach for Handling Physical Activity Missing Data
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DOI：
10.1080/02701367.2009.10599546
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发表时间：
2009-06-01
影响因子：
2.2
通讯作者：
Mahar, Matthew T.
中科院分区：
文献类型：
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作者：
Kang, Minsoo;Rowe, David A.;Mahar, Matthew T.
本研究的目的是验证以个人信息(II)为中心处理缺失数据的方法，使用118名中年人和9.1名老年人的数据样本，这些数据样本配备了Yamax SW-200型计步器和Acligraph加速计，为期7天。我们使用半模拟方法创建了六个数据集：两组(即中年人和老年人)的三个体力活动结果测量(即步数、活动次数和中等到剧烈体力活动的分钟数)。在分别分析了每个数据集之后，我们用两个以II为中心的方法和两个以组信息(GI)为中心的方法替换了缺失值。使用均方根差(RMSD)、平均符号差、配对t检验和皮尔逊相关性来确定各种恢复方法的有效性。总体而言，对于两组中的每个数据集，以II为中心的方法显示的RMSD小于以GI为中心的方法。我们发现在所有条件下，已知值和替换值之间没有显著的均值差异。以II为中心的方法比以GI为中心的方法产生了更好的结果。对于中老年人的计步器和加速度计数据，我们确定用剩余天数的平均值来替换缺失数据点是一种准确的缺失数据恢复方法。
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 9.1 older adults equipped with Yamax SW-200 pedometers and Acligraph 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 differences, 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.