"However, this perception has not been backed up with rigorous, empirical research on the issue.
But as the report emphasizes, those studies remain far from truly rigorous empirical research.
All three men accepted the dominion of modern science; their aim was to imitate its methods and provide rigorous, empirical evidence of a spiritual realm.
Unfortunately, rigorous empirical studies have repeatedly shown that none of these things bring about any meaningful improvement in intelligence.
Hence, one might imagine an NGO — let's call it Harmony House — that relies on rigorous empirical methods to determine the extent of harmony in the world.
At the same time, off-the-cuff or "gut-feel" estimates of these probabilities are probably not a good substitute for an effort to determine them through a more rigorous, empirical and rule-driven means.
"The best growth hackers take a rigorous, empirical approach to growth and distribution," says Jesse.
Hitherto such claims have not yet been subject to rigorous empirical testing.
This intuitive argument, however, lacks support from rigorous empirical research and theoretical analyses.
Rigorous empirical studies of this concept, however, have yet to be presented.
However, there is a paucity of rigorous empirical research that has investigated these assertions.
