Variance from categories

[Capitano_Fl99]

Hello,

i am struggling to find the good formula to calculate a variance. I have a table with categories which are quarters but in text format not in date type. And I have a measure in percentage in an other table. I don't arrived to calculate the variation between the categories .

What should I do use?

[EylesIT]

Try using a different calculation

[Capitano_Fl99]

I tried various but no one works.