Hello Enrico Stancanelli for 1 - change the formula to:
if window_avg([Growth at Costant rates]) > 0 then "Positive"
This way the table calc can go across based on the value of that field for the row. this will fix the green/red issue for the row.
For 2 - we can't remove the column in this view. We could change the nulls to zero or you could do something like what Jim Wahl did in his reply here: HIde an empty column to combine both the data for the year and the change percent into a single field.
I'm not following the third question related to blind/public portion of the question so maybe someone else can help or you can expand on that one?
I hope that helps.
thanks for you help, the first formula is great ! for the second question i realize that this is impossibile, like a pivot tableau on excel. For the third i decided to work on excel before to import my dataset on tableau, resolving my problem!
thank you very much!