Table 6 Results of PPR models.

Type	Group	Measured value	Predicted value	Absolute error	Relative error (%)
H1	1	0.793	0.792	− 0.001	0.164
	2	0.653	0.656	0.003	0.490
	3	0.564	0.558	− 0.006	1.082
	4	0.702	0.698	− 0.004	0.527
	5	0.564	0.565	0.001	0.230
	6	0.523	0.526	0.003	0.574
	7	0.603	0.611	0.008	1.244
	8	0.55	0.549	− 0.001	0.200
	9	0.431	0.428	− 0.003	0.650
H2	1	0.764	0.764	− 0.001	0.065
	2	0.653	0.660	0.007	1.072
	3	0.587	0.584	− 0.003	0.545
	4	0.711	0.704	− 0.007	1.055
	5	0.588	0.586	− 0.002	0.323
	6	0.534	0.539	0.005	0.899
	7	0.621	0.626	0.005	0.741
	8	0.548	0.544	− 0.004	0.730
	9	0.451	0.452	0.001	0.133
H3	1	0.702	0.700	− 0.002	0.342
	2	0.628	0.629	0.001	0.175
	3	0.523	0.522	− 0.001	0.249
	4	0.693	0.693	0.000	0.058
	5	0.657	0.655	− 0.002	0.244
	6	0.502	0.507	0.005	0.936
	7	0.647	0.648	0.001	0.139
	8	0.573	0.572	− 0.001	0.262
	9	0.457	0.457	0.000	0.088

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