Is missing geographic positioning system data in accelerometry studies a problem, and is imputation the solution?
The main purpose of the present study was to assess the impact of global positioning system (GPS) signal lapse on physical activity analyses, discover any existing associations between missing GPS data and environmental and demographics attributes, and to determine whether imputation is an accurate...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
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PAGEPress Publications
2016-05-01
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| Series: | Geospatial Health |
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| Online Access: | http://www.geospatialhealth.net/index.php/gh/article/view/403 |
| _version_ | 1819063997197975552 |
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| author | Kristin Meseck Marta M. Jankowska Jasper Schipperijn Loki Natarajan Suneeta Godbole Jordan Carlson Michelle Takemoto Katie Crist Jacqueline Kerr |
| author_facet | Kristin Meseck Marta M. Jankowska Jasper Schipperijn Loki Natarajan Suneeta Godbole Jordan Carlson Michelle Takemoto Katie Crist Jacqueline Kerr |
| author_sort | Kristin Meseck |
| collection | DOAJ |
| description | The main purpose of the present study was to assess the impact of global positioning system (GPS) signal lapse on physical activity analyses, discover any existing associations between missing GPS data and environmental and demographics attributes, and to determine whether imputation is an accurate and viable method for correcting GPS data loss. Accelerometer and GPS data of 782 participants from 8 studies were pooled to represent a range of lifestyles and interactions with the built environment. Periods of GPS signal lapse were identified and extracted. Generalised linear mixed models were run with the number of lapses and the length of lapses as outcomes. The signal lapses were imputed using a simple ruleset, and imputation was validated against person-worn camera imagery. A final generalised linear mixed model was used to identify the difference between the amount of GPS minutes pre- and post-imputation for the activity categories of sedentary, light, and moderate-to-vigorous physical activity. Over 17% of the dataset was comprised of GPS data lapses. No strong associations were found between increasing lapse length and number of lapses and the demographic and built environment variables. A significant difference was found between the pre- and postimputation minutes for each activity category. No demographic or environmental bias was found for length or number of lapses, but imputation of GPS data may make a significant difference for inclusion of physical activity data that occurred during a lapse. Imputing GPS data lapses is a viable technique for returning spatial context to accelerometer data and improving the completeness of the dataset. |
| first_indexed | 2024-12-21T15:23:34Z |
| format | Article |
| id | doaj.art-f58a226c6c984fbf8afdc07ef209d875 |
| institution | Directory Open Access Journal |
| issn | 1827-1987 1970-7096 |
| language | English |
| last_indexed | 2024-12-21T15:23:34Z |
| publishDate | 2016-05-01 |
| publisher | PAGEPress Publications |
| record_format | Article |
| series | Geospatial Health |
| spelling | doaj.art-f58a226c6c984fbf8afdc07ef209d8752022-12-21T18:58:58ZengPAGEPress PublicationsGeospatial Health1827-19871970-70962016-05-0111210.4081/gh.2016.403368Is missing geographic positioning system data in accelerometry studies a problem, and is imputation the solution?Kristin Meseck0Marta M. Jankowska1Jasper Schipperijn2Loki Natarajan3Suneeta Godbole4Jordan Carlson5Michelle Takemoto6Katie Crist7Jacqueline Kerr8Department of Family Medicine and Public Health, University of California, La Jolla, CADepartment of Family Medicine and Public Health, University of California, La Jolla, CADepartment of Sports Science and Clinical Biomechanics, University of Southern Denmark, OdenseDepartment of Family Medicine and Public Health, University of California, La Jolla, CADepartment of Family Medicine and Public Health, University of California, La Jolla, CACenter for Children's Healthy Lifestyles and Nutrition, Children’s Mercy Hospital-University of Missouri, Kansas City, MODepartment of Family Medicine and Public Health, University of California, La Jolla, CADepartment of Family Medicine and Public Health, University of California, La Jolla, CADepartment of Family Medicine and Public Health, University of California, La Jolla, CAThe main purpose of the present study was to assess the impact of global positioning system (GPS) signal lapse on physical activity analyses, discover any existing associations between missing GPS data and environmental and demographics attributes, and to determine whether imputation is an accurate and viable method for correcting GPS data loss. Accelerometer and GPS data of 782 participants from 8 studies were pooled to represent a range of lifestyles and interactions with the built environment. Periods of GPS signal lapse were identified and extracted. Generalised linear mixed models were run with the number of lapses and the length of lapses as outcomes. The signal lapses were imputed using a simple ruleset, and imputation was validated against person-worn camera imagery. A final generalised linear mixed model was used to identify the difference between the amount of GPS minutes pre- and post-imputation for the activity categories of sedentary, light, and moderate-to-vigorous physical activity. Over 17% of the dataset was comprised of GPS data lapses. No strong associations were found between increasing lapse length and number of lapses and the demographic and built environment variables. A significant difference was found between the pre- and postimputation minutes for each activity category. No demographic or environmental bias was found for length or number of lapses, but imputation of GPS data may make a significant difference for inclusion of physical activity data that occurred during a lapse. Imputing GPS data lapses is a viable technique for returning spatial context to accelerometer data and improving the completeness of the dataset.http://www.geospatialhealth.net/index.php/gh/article/view/403GPSGISMissing dataImputationAccelerometer |
| spellingShingle | Kristin Meseck Marta M. Jankowska Jasper Schipperijn Loki Natarajan Suneeta Godbole Jordan Carlson Michelle Takemoto Katie Crist Jacqueline Kerr Is missing geographic positioning system data in accelerometry studies a problem, and is imputation the solution? Geospatial Health GPS GIS Missing data Imputation Accelerometer |
| title | Is missing geographic positioning system data in accelerometry studies a problem, and is imputation the solution? |
| title_full | Is missing geographic positioning system data in accelerometry studies a problem, and is imputation the solution? |
| title_fullStr | Is missing geographic positioning system data in accelerometry studies a problem, and is imputation the solution? |
| title_full_unstemmed | Is missing geographic positioning system data in accelerometry studies a problem, and is imputation the solution? |
| title_short | Is missing geographic positioning system data in accelerometry studies a problem, and is imputation the solution? |
| title_sort | is missing geographic positioning system data in accelerometry studies a problem and is imputation the solution |
| topic | GPS GIS Missing data Imputation Accelerometer |
| url | http://www.geospatialhealth.net/index.php/gh/article/view/403 |
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