Table 5.

Model summary.

Model	R ordinary	R squared after adjustment	Errors in standard estimation
1	0.426	0.423	0.53389
2	0.525	0.522	0.48672
3	0.554	0.546	0.47431
4	0.578	0.566	0.46278
5	0.591	0.583	0.45521
6	0.607	0.594	0.44721
7	0.620	0.603	0.44161
8	0.631	0.621	0.43469
9	0.636	0.624	0.43456
10	0.641	0.623	0.43221
11	0.647	0.625	0.43091
12	0.652	0.629	0.42876
13	0.656	0.631	0.42676