R package PhysicalActivity: Process Accelerometer Data for Physical Activity Measurement. It provides a function ”wearingMarking” for classification of monitor wear and nonwear time intervals in accelerometer data collected to assess physical activity. The package also contains functions for making plot for accelerometer data and obtaining the summary of various information including daily monitor wear time and the mean monitor wear time during valid days. The revised package version 0.2-1 improved the functions in the previous version regarding speed and robustness. In addition, several functions were added: ”markDelivery” can classify days for ActiGraph delivery by mail; ”markPAI” can categorize physical activity intensity level based on user-defined cut-points of accelerometer counts. It also supports importing ActiGraph AGD files with ”readActigraph” and ”queryActigraph” functions. The package also better supports time zones and daylight saving.

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