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Where did we get our defaults for the Wear Time Validation algorithms?

Last Updated: Feb 21, 2018 04:31PM CST

The defaults for the Troiano Wear Time Validation were derived from the SAS code used to analyze the 2003-2004 NHANES PAM dataset.  This source code is available at

The defaults for the Choi Wear Time Validation were derived from Validation of Accelerometer Wear and Nonwear Time Classification Algorithm by L. Choi, Z. Liu, C. Matthews and M. Buchowski (  It is important to note that the "Small Window" (Window-2) value described in the paper is 30 minutes while the actual R code referenced in the paper has a value of 45 minute for this number.  We chose to use the documented value of 30 as the default.

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