Please, help me to uderstand result of Apriori alghorithm

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Please, help me to uderstand result of Apriori alghorithm

Abacap
 
The result I have in Weka is:
 
4. potatoes=y beer=y 2 ==> onion=y 2    <conf:(1)> lift:(1.5) lev:(0.11) [0] conv:(0.67)
 
So I see that there were 2 bindings "potatoes <=> beer" in baskets (2 times clients bougth potatoes and beer). And when there were such connections, in basket there was also onion.
So "conf" is 1 because 2/2 = 1 (there will always be 1 so what is the sense of this "1"?)
Do I correctly interpret these numbers?
 
What is "lift" and how this is calculated? Same about "lev" and "conv".
 
Regards
 
 
 

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