The Flow matrix is a novel method to describe and extrapolate transitions among categories. The Flow matrix extrapolates a constant transition size per unit of time on a time continuum with a maximum of one incident per observation during the extrapolation. The Flow matrix extrapolates linearly until the persistence of a category shrinks to zero. https://xxhtvwwxxksuyf.nizarblog.com/35080396/understanding-the-impact-of-the-covid-19-pandemic-on-u-s-older-adults-self-reported-pandemic-related-concerns-and-consequences-in-a-cross-sectional-survey-study