The Risk Analysis and Modeling of Byco Petroleum in Pakistan Using Extreme Value Theory

Table 4

Weekly minima GEV and GL PWM parameter estimates and AD value.

GEV estimates						GL estimates
Subperiods	N	Alpha	Beta	Gamma	value	Alpha	Beta	Gamma	value	Better fit
S = 1
	384	−0.0249	0.0732	0.3339	0.136	−0.0003	0.0403	0.02757	0.039	GEV
S = 2
	192	−0.0323	0.0864	0.3617	0.338	−0.0028	0.0470	0.0425	0.185	GEV
	192	−0.0183	0.0582	0.2578	0.035	0.0023	0.0334	−0.1456	0.149	GL
S = 4
	96	−0.0319	0.0705	0.1735	0.696	−0.0061	0.0423	−0.0631	0.335	GEV
	96	−0.0314	0.1003	0.5300	0.029	0.0007	0.0562	0.1288	0.069	GL
	96	−0.0174	0.0633	0.2624	0.455	0.0050	0.0362	−0.0119	0.520	GL
	96	−0.0197	0.0536	0.2432	0.160	−0.0006	0.0308	−0.0171	0.160	GL
S = 10
	38	−0.0286	0.0710	0.3456	0.610	−0.0041	0.0389	0.0338	0.435	GEV
	38	−0.0356	0.0824	0.0425	0.640	−0.0024	0.0532	−0.1428	0.460	GEV
	38	−0.0246	0.0587	0.4581	0.589	−0.0053	0.0304	0.0928	0.367	GEV
	38	−0.0034	0.0615	0.5681	0.009	0.0160	0.0302	0.1473	0.165	GL
	38	−0.0661	0.1445	0.5422	0.330	−0.0198	0.0724	0.1347	0.178	GEV
	38	−0.0140	0.0592	0.2419	0.210	0.0071	0.0342	−0.0235	0.289	GL
	38	−0.0226	0.0855	0.2170	0.035	0.0081	0.0502	0.0378	0.066	GL
	38	0.0217	0.0393	0.2585	0.164	−0.0077	0.0225	−0.0141	0.106	GEV
	38	−0.0186	0.0572	0.4396	0.052	0.0003	0.0299	0.0834	0.063	GL
	38	−0.0130	0.5508	0.2001	0.936	0.0069	0.0326	−0.0475	0.936	GL