if nan -> find value in cell above Pandas

[deanhystad]

There is not enough information for me to understand what you are asking. The code is incomplete, so I cannot run the program and see what happens, and your question is lacking detail. Wat does "cannot make proper loop through" mean. Are you getting an error? Does the code run but it is not doing what you want? I know the latter is true because:

value = survey[index-1]

Is not going to replace a NAN in survey.