To validate the proposed approach, the statistical analysis of method is done for 50 trials for population size 30 and 40 iterations. The best, average and worst solution obtained during these trials are tabulated in Table 8. Looking at Table 8, it is found that best, average and mean solution of firefly and LIA based approach is better than existing methods. The total computation time of the proposed approach is 234.08 seconds while it is less in DE and DEPSO methods. The computational time is affected by the step size of incremental load which is added in LIA. But solution obtained is better than other existing methods.