# What are the ranking methods based on preferences?

I dont mean some MCDM ranking methods because we have to put the weights for criteria in MCDM. I am wondering is there any ranking method base on the preference input. For example: we have 10 people give their preferences on 3 items I1, I2, I3. The format of the preference will be :

 P1: I1<I3<I2...
P2: I1<I2<I3
...
P10: I3<I1<I2


And the output after applying a ranking method will be

 I1<I2<I3.