# Correlation of ranked ordered list

Suppose I have n=3 of ranked ordered list of items:

R1=<i1, i2, i3>
R2=<i2,i1, i3>
R3=<i1, i2, i3>


I want to compute the correlation of an ordered list R= of same items.

1) Is "Kendall rank" the right correlation coefficient to use?

2) If yes, how to calculate the correlation average between R and other lists Ri since the coefficient returns negative values. Should I take negative values, though?