Does anyone know how to find correlation between 3 variables?

I have 3 variables that consist: - Duration (< 2 hour [short], 3 hour [mid], > 3 hour [long] - Body posture (1 [safe], 2 [small risk], 3 [middle risk], 4 [very high risk]) - Pain (1 [low], 2...

01 January 1970 115 34 View