Table 1.

Comparison of partitioning with principal points for original data, Legendre polynomial coefficients and Fourier coefficients in 500 repetitions and m = 20 repeated design points with low noise σ = 0.5 and high noise σ = 1.5

	K = 6 subsets	σ = 0.5		σ = 1.5
Number of coeff		Mean Silhouette	Connectivity	Mean Silhouette	Connectivity
J = 3	Original data: y	0.114	102.05	0.076	105.54
	Legendre coeff: LPC	0.531	25.036	0.511	23.932
	Fourier coeff: FC	0.270	61.628	0.235	63.621
J = 4	Original data: y	0.118	102.691	0.082	105.497
	Legendre coef: LPC	0.534	22.699	0.539	22.614
	Fourier coeff: FC	0.235	68.572	0.224	73.308
J = 5	Original data: y	0.116	101.743	0.081	105.343
	Legendre coeff: LPC	0.547	22.526	0.539	22.846
	Fourier coeff: FC	0.212	74.110	0.198	77.572