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this could be basic, but bear with me:

my current ECJ configuration uses a fixed mutation rate for the mutation 
operator. in ES theory, the mutation rate is used in binary search spaces, 
determining the probability of flipping e.g. a 1-bit in a parental vector 
y. In my real-valued search space the mutation strength, i.e. the standard 
deviation of a single component of the mutation vector, is used in the 
mutation operator. to quote H-P Schwefel: "The mutation rate in binary 
search spaces is viewed as the pendant to the mutation strength in real-
valued search spaces".

my question is therefore:
is the use of a mutation rate in a real-valued search space "ok"?
is there a possibility in ECJ to replace the mutation rate with the 
mutation strength?

I'm also looking into the concept of self-adapting mutation strength/rate, 
so I`m grateful for any useful information related to this in an ECJ 
context.

thanks,
Ivar Nastad
NTNU