All my apologies ! please let me try to clarify.
1. Paired sample : a set of participants is asked the same question twice (they gather new elements in-between and consequently their answers might differ). I guess this would be a paired sample ?
2. More than two categorical answers (as seemingly in Cochran) : the question looks like : ‘How do you interpret this picture ?’ and consequently the answers define different categories (such as ‘coincidental meeting’, ‘revolution’, ‘celebration’, …)
My question is : which is the most appropriate way to calculate whether there is a significant shift in the answers (. a significant change in the proportions of every choice in the final set of answers ?)
If there is no simple way to do this, might you have some idea concerning how to transform this problem to find an appropriate significativity test ?
Many thanks in advance for you precious advice 🙂