I'd like to ask if I can say :
A positive statement is defined to be a statement of fact. If we gather data on the number of people in the labor force who are unemployed and calculate the unemployment rate as 8.6%, then the statement, "The unemployment rate is 8.6%" is a positive statement because it is a simple statement of fact.
instead of
A positive statement is defined to be a statement of fact. If we gather data on the number of people in the labor force who are unemployed and calculate the unemployment rate to be 8.6%, then the statement, "The unemployment rate is 8.6%" is a positive statement because it is a simple statement of fact.