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GE successfully found the
X+X2+X3+X4 target function in the original experiments and again with the Steady State selection. Using the Steady State selection saw an improvement over previous results and a cumulative frequency measure can be seen in Figure 2. In the original experiments only 2% of the runs would find the target expression within the designated 50 generations. Now, however 95% of the runs successfully find the solution within this time frame.
Symbolic Regression cumulative frequency measure.