Academic journal article Research Quarterly for Exercise and Sport

An Experimental Determination of the Best Missing-Value Recovery Method in Assessing Physical Activity Using Pedometers. (Measurement)

Academic journal article Research Quarterly for Exercise and Sport

An Experimental Determination of the Best Missing-Value Recovery Method in Assessing Physical Activity Using Pedometers. (Measurement)

Article excerpt

Tracking the number of steps a person walked using pedometers has become one of the most commonly used practical measures in assessing physical activity. The purpose of this study was to determine empirically the most effective method to recover the missing values in a step-count data set. A total of 117 participants were measured using pedometers for 21 consecutive days and 54 of them had no missing values. Fifty-four participants were randomly selected from those who had missing values (n = 63) and their missing values patterns were applied to those who had none, i.e., remove the data according to the same missing days. Nine recovery methods were applied to this artificial missing data set. They included four individual- and five group-centered methods, that is, replace a missing value using the mean of: (a) the remaining days, (b) the remaining weekdays or weekends depending on the type of a missing day, (c) the remaining weekdays or weekend in the same week the missing occurred, (d) the same days, but in other weeks (e.g., replace a missing Monday by the means of Mondays in other 2 weeks), (e) the other participants on the same missing day, (f) the other participants in the entire days, (g) the other participants based on the type of day, (h) the other participants for the particular week or weekend the missing value occurred, and (i) the other participants of the common days. …

Search by... Author
Show... All Results Primary Sources Peer-reviewed

Oops!

An unknown error has occurred. Please click the button below to reload the page. If the problem persists, please try again in a little while.