[tor-talk] Why adding Guard-Exit (EE) node in Tor yeild more catch probability than adding guard and exit node separately?

[saurav dahal]

I am trying to observe the catch probability i.e. probability that a client
selects my added guard as well as exit node while making a circuit.

First I inserted certain number of guard nodes and certain number of exit
nodes in Tor network and performed the simulation in Shadow simulator.
After completion of simulation, I calculated the catch probability.

Then again I added the same number of Guard-Exit (EE) node and perform the
simulation and calculated the probability.

I found that catch probability for EE nodes are much higher than those of
guard and exit node separately.

Could anyone please explain why this happened?

-- 

Saurav