I am trying to compute a total score by add numbers from various questions. However, for each of these question, the instruction is to input “99” for don’t know/Not sure.
q1. How many bags of rice did you produce in 2021?
q2. How many bags of rice did you produce in 2010?
the calculation would q1+q2
Now if someone should input 99 in either q1 or q2, it should not be added more like treated as zero.
Can someone please help me or refer me to a similar problem if previously asked?