getFirstTimestamp

<p>Extract first timestamp from GENEActiv file, only used
  when using the selectdaysfile argument. Function not designed for
  direct use by package user.</p>

A tool to process and analyse data collected with wearable raw acceleration sensors as described in Migueles and colleagues (JMPB 2019), and van Hees and colleagues (JApplPhysiol 2014; PLoSONE 2015). The package has been developed and tested for binary data from 'GENEActiv' <https://www.activinsights.com/> and GENEA devices (not for sale), .csv-export data from  'Actigraph' <https://actigraphcorp.com> devices, and .cwa and .wav-format data from 'Axivity' <https://axivity.com>. These devices are currently widely used in research on human daily physical activity. Further, the package can handle accelerometer data file from any other sensor brand providing that the data is stored in csv format and has either no header or a two column header. Also the package allows for external function embedding.

Vincent T van Hees

GGIR

Raw Accelerometer Data Analysis

Zhou Fang

Jing Hua Zhao

Joe Heywood

Evgeny Mirkes

Severine Sabia

Joan Capdevila Pujol

Jairo H Migueles

Matthew R Patterson

Dan Jackson

Lena Kushleyeva

Mathilde Chen

Manasa Yerramalla

Tuomo Nieminen

John Muschelli

Patrick Bos

getFirstTimestamp function

Extract first timestamp from GENEActiv file — getFirstTimestamp

Extract first timestamp from GENEActiv file

getFirstTimestamp: Extract first timestamp from GENEActiv file

Description

Usage

Arguments

Value