347157.fig.0011a
(a)
347157.fig.0011b
(b)
347157.fig.0011c
(c)
347157.fig.0011d
(d)
Figure 11: Values of RMSE versus the percentage of features selected when running PSO and CPSO—the use of the housing dataset: (a) 20% of selected data, (b) 30% of selected data, (c) 50% of selected data, and (d) 70% of selected data.