The independent variables tested in our models are summarized
as follows: Calendar data
Three dummy variables (Hit) represent the effect of the
holidays depending on which weekday they take place (i ¼ 1
denotes a weekday, i ¼ 2 denotes a Saturday and i ¼ 3 denotes
a Sunday). Each variable takes value 0 or 1 depending
on the day of that holiday.