1. α
=
2

S 
K
 1 − ∑ 2i 
K −1 
ST 


1
1
2
3
4
5
6
7
8
9
10
11
12
13
2
1
1
1
1
1
1
1
1
1
1
1
1
1
2
1
1
1
2
1
1
2
2
1
1
1
1
3
4
5
6
7
8
Suma de
Items