Need to quantify the relationship Ra = C1* s^C2 v^C3 Re^C4

this is for my lab report on effective maching of surface roughness using a lathe. we have been asked to quantify Ra = C1* s^C2 v^C3 Re^C4 where Ra is surface roughness, s is feedrate, v is cutting velocity and Re is the nose radius of the tool. we have performed experiment to get values of Ra for combinations of different v,s and Re. My problem is that I don't kno how to use this data to define the constants in the relationship above. Can you tell me how to do this?