Our study shows that there is surprisingly large day - to - day variation in the rate at which individuals interact. (sciencedaily.com)
2 weeks will also give you enough time to take day to day variations in your stress levels into account. (supernaturalacnetreatment.com)
Daily averages have continued at this level or higher through Jan. 9, though they could continue to dance up and down around that mark due to day - to - day variations caused by weather systems. (scientificamerican.com)