Past training, the instructor said, has been based on studies of hijackings that included passengers' descriptions of hijackers' actions and reports by members of teams that rescued them.
Until now, everything we have learned about the universe has been based on studies of electromagnetic radiation – from infrared to visible light to gamma rays.
To date, the research that has suggested this predictive quality has been based on studies that have focused on crime patterns in western industrialised countries, such as the UK, USA and Australia.
Others have been based on studies of short duration (less than a few weeks) where the action of being observed may positively or negatively influence the performance of the observee ("observer" effect).
Until now, current CrossFit scientific literature has been based on studies that investigated the effects of CrossFit on body composition, psycho-physiological parameters, musculoskeletal injury risk, life and health aspects, and psycho-social behavior.
The importance of regression-to-the-mean was not fully understood until about 1980, and a substantial part of what was regarded as known at that time may have been based on studies not controlling for regression-to-the-mean.
