Consider a database with 4 transactions:
Transaction 1: {cheese, bread, milk}
Transaction 2: {soda, bread, milk}
Transaction 3: {cheese, bread}
Transaction 4: {cheese, soda, juice}
The minimum support is 25%. Which rule has a confidence equal to 50%?
A.
{bread,milk} => {cheese}
B.
{bread} => {milk}
C.
{juice} => {soda}
D.
{bread} => {cheese}
D is not the correct answer:
S({bread, cheese}) = 0,5
S({bread}) = 0,75
C({bread} => {cheese}) = 0.5 / 0,75 = 66,66%
The right answer is A:
S({bread, milk, cheese}) = 0,25
S({bread, milk}) = 0,5
C({bread, milk, cheese} => {bread, milk}) = 0,25 / 0,5 = 50%
0
0
I agree with Brow, the only thing wrong in you explanation is the last line… so it should be like this:
S({bread, milk, cheese}) = 0,25
S({bread, milk}) = 0,5
C({bread, milk} => {cheese}) = 0,25 / 0,5 = 50%
1
0
I agree with you too
0
0