“…Following Wright (1976), Friedrich (1982), and Leona and West (1991), it can be argued that not just the slope of gr i,t→T on F i,t varies depending on the values of D i,t , I i,t and their interaction, i.e., I i,t D i,t , as Equation (3) shows, but also the standard error associated with this slope. According to Butkus et al (2020), the standard error of the estimated composite term…”