Physical activity and inactivity are two independent dimensions over which children aggregate into distinct behavioural profiles. Read my new article ‘Probabilistic principal component analysis to identify profiles of physical activity behaviours in the presence of non-ignorable missing data’ in the Journal of the Royal Statistical Society: Series C at http://onlinelibrary.wiley.com/doi/10.1111/rssc.12105/abstract.
Read my #OpenAccess article ‘A Gradient Search Maximization Algorithm for the Asymmetric Laplace Likelihood’ at http://bit.ly/1j99BKN!
The R package pawacc in now available on CRAN. This package collects functions to read, process and store accelerometer files. Models supported: Actigraph GT1M, GT3X and ActiSleep.