Service Capacity Reserve under Uncertainty by Hospital’s ER Analogies: A Practical Model for Car Services

Table 5

95% confidence intervals.

(a)

Description	Input variable	Mean	Standard error	95% Confidence intervals
				Lower limit	Upper limit
Elective demand	ED	147,859	4,32304	139,305	156,414
Nonelective demand	NED	13,3672	0,824012	11,7366	14,9978
Total demand	TV	161,328	4,51834	152,286	170,168

(b)

Description	Input variable	Sigma	Lower limit	Upper limit
Elective demand	ED	48,9096	43,5628	55,7652
Nonelective demand	NED	9,32263	8,30348	10,6294
Total demand	TV	51,1192	45,5308	58,2845

(c)

Output variable	Output variable	Mean	Standard error	Lower limit	Upper limit
Capacity reserve cost for all; nonelective demands (€)	CAPRNED1	1861,14	4,5	1852,31	1869,96
	CAPRNED2	2122,64	5,15	2112,54	2132,74
Cost of an empty work bay (€)	CEW1	34,26	0,06	34,14	34,39
	CEW2	39,07	0,07	38,93	39,21
Efficiency per vehicle in service (%)	EFCvh1	0,35	0,001	0,34	0,35
	EFCvh2	0,36	0,001	0,36	0,37
Cost of purchased parts (€)	PartCost1	402,27	0,76	400,79	403,75
	PartCost2	458,65	0,86	456,96	460,34
Average profit per vehicle in the workshop (€)	PFunit1	120,83	0,37	120,11	121,56
	PFunit2	137,82	0,42	136,99	138,65
Monthly workshop total cost (€)	TExp1	411,18	0,76	409,69	412,66
	TExp2	468,83	0,86	467,14	470,52

(d)

Output variable	Output variable	Sigma	Lower limit	Upper limit
Capacity reserve cost for all; nonelective demands (€)	CAPRNED1	450,33	444,18	456,66
	CAPRNED2	515,21	508,17	522,45
Cost of an empty work bay (€)	CEW1	6,31	6,22	6,4
	CEW2	7,2	7,1	7,3
Efficiency per vehicle in service(%)	EFCvh1	0,25	0,24	0,25
	EFCvh2	0,24	0,24	0,25
Cost of purchased parts (€)	PartCost1	75,54	74,51	76,6
	PartCost2	86,22	85,04	87,43
Average profit per vehicle in the workshop(€)	PFunit1	37	36,49	37,52
	PFunit2	42,29	41,71	42,88
Monthly workshop total cost (€)	TExp1	75,71	74,68	76,78
	TExp2	86,42	85,24	87,64