Table 4. Statistical analysis of...

Table 4.

Statistical analysis of maintenance issues risks

		Probability			Impact
System component	Defect SN	Mean	RII	SD	Mean	RII	SD	RI	Rank
Internal environment	1	3.14	0.628	2.26	2.975	0.595	2.00	9.340	27
	2	2.88	0.577	1.89	2.975	0.595	2.01	8.579	31
	3	3.09	0.619	2.11	3.575	0.715	2.42	11.058	6
	4	2.84	0.567	1.70	3.300	0.660	2.46	9.363	26
	5	3.09	0.619	2.04	3.350	0.670	2.14	10.362	13
	6	2.95	0.591	2.39	3.150	0.630	2.23	9.303	28
	7	2.79	0.558	1.67	2.900	0.580	1.53	8.093	37
	8	2.65	0.530	2.28	3.125	0.625	2.38	8.285	35
	9	2.51	0.502	1.72	2.538	0.508	1.99	6.376	41
	10	2.88	0.577	2.03	2.769	0.554	2.03	7.986	39
Air handling unit (AHU) and fan coil unit (FCU)	11	3.32	0.664	2.56	3.333	0.667	2.42	11.061	5
	12	3.33	0.665	2.60	3.282	0.656	2.04	10.915	7
	13	3.40	0.679	2.84	3.487	0.697	2.37	11.840	1
	14	3.02	0.605	2.08	3.333	0.667	2.34	10.078	16
	15	3.16	0.633	2.41	3.154	0.631	2.38	9.975	19
	16	2.93	0.586	2.30	2.974	0.595	2.00	8.716	30
	17	3.35	0.670	2.62	3.256	0.651	2.53	10.905	8
	18	3.00	0.600	1.94	2.769	0.554	2.38	8.308	34
	19	2.86	0.572	1.51	3.282	0.656	2.37	9.388	24
Air distribution and terminal systems	20	3.19	0.637	2.09	3.333	0.667	2.42	10.620	10
	21	3.23	0.647	1.84	3.615	0.723	2.47	11.687	2
	22	3.21	0.642	2.61	3.385	0.677	2.81	10.862	9
	23	3.33	0.665	2.30	3.128	0.626	2.44	10.403	12
	24	3.30	0.660	2.49	3.205	0.641	2.20	10.584	11
	25	3.19	0.637	1.61	3.154	0.631	2.10	10.048	17
	26	3.07	0.614	1.73	3.333	0.667	2.25	10.233	14
Chillers	27	3.33	0.665	2.31	3.333	0.667	2.43	11.085	4
	28	3.02	0.605	2.16	3.359	0.672	2.64	10.155	15
	29	3.12	0.623	2.03	3.205	0.641	2.62	9.988	18
	30	2.77	0.553	2.08	3.385	0.677	2.76	9.367	25
	31	2.72	0.544	1.76	3.128	0.626	2.71	8.512	33
	32	2.74	0.549	1.74	3.359	0.672	2.28	9.218	29
	33	2.93	0.586	2.23	3.385	0.677	2.63	9.918	20
	34	2.84	0.567	2.35	3.000	0.600	2.10	8.512	32
	35	2.60	0.521	1.78	3.128	0.626	2.27	8.148	36
	36	2.47	0.493	1.87	3.026	0.605	2.25	7.459	40
Cooling tower	37	3.09	0.619	2.02	3.179	0.636	2.50	9.834	21
	38	3.19	0.637	2.22	3.564	0.713	2.43	11.355	3
	39	3.09	0.619	2.36	3.179	0.636	2.66	9.834	21
	40	2.84	0.567	1.84	3.385	0.677	2.46	9.603	23
	41	2.74	0.549	2.28	2.925	0.585	2.11	8.027	38

		Probability			Impact
System component	Defect SN	Mean	RII	SD	Mean	RII	SD	RI	Rank
Internal environment	1	3.14	0.628	2.26	2.975	0.595	2.00	9.340	27
	2	2.88	0.577	1.89	2.975	0.595	2.01	8.579	31
	3	3.09	0.619	2.11	3.575	0.715	2.42	11.058	6
	4	2.84	0.567	1.70	3.300	0.660	2.46	9.363	26
	5	3.09	0.619	2.04	3.350	0.670	2.14	10.362	13
	6	2.95	0.591	2.39	3.150	0.630	2.23	9.303	28
	7	2.79	0.558	1.67	2.900	0.580	1.53	8.093	37
	8	2.65	0.530	2.28	3.125	0.625	2.38	8.285	35
	9	2.51	0.502	1.72	2.538	0.508	1.99	6.376	41
	10	2.88	0.577	2.03	2.769	0.554	2.03	7.986	39
Air handling unit (AHU) and fan coil unit (FCU)	11	3.32	0.664	2.56	3.333	0.667	2.42	11.061	5
	12	3.33	0.665	2.60	3.282	0.656	2.04	10.915	7
	13	3.40	0.679	2.84	3.487	0.697	2.37	11.840	1
	14	3.02	0.605	2.08	3.333	0.667	2.34	10.078	16
	15	3.16	0.633	2.41	3.154	0.631	2.38	9.975	19
	16	2.93	0.586	2.30	2.974	0.595	2.00	8.716	30
	17	3.35	0.670	2.62	3.256	0.651	2.53	10.905	8
	18	3.00	0.600	1.94	2.769	0.554	2.38	8.308	34
	19	2.86	0.572	1.51	3.282	0.656	2.37	9.388	24
Air distribution and terminal systems	20	3.19	0.637	2.09	3.333	0.667	2.42	10.620	10
	21	3.23	0.647	1.84	3.615	0.723	2.47	11.687	2
	22	3.21	0.642	2.61	3.385	0.677	2.81	10.862	9
	23	3.33	0.665	2.30	3.128	0.626	2.44	10.403	12
	24	3.30	0.660	2.49	3.205	0.641	2.20	10.584	11
	25	3.19	0.637	1.61	3.154	0.631	2.10	10.048	17
	26	3.07	0.614	1.73	3.333	0.667	2.25	10.233	14
Chillers	27	3.33	0.665	2.31	3.333	0.667	2.43	11.085	4
	28	3.02	0.605	2.16	3.359	0.672	2.64	10.155	15
	29	3.12	0.623	2.03	3.205	0.641	2.62	9.988	18
	30	2.77	0.553	2.08	3.385	0.677	2.76	9.367	25
	31	2.72	0.544	1.76	3.128	0.626	2.71	8.512	33
	32	2.74	0.549	1.74	3.359	0.672	2.28	9.218	29
	33	2.93	0.586	2.23	3.385	0.677	2.63	9.918	20
	34	2.84	0.567	2.35	3.000	0.600	2.10	8.512	32
	35	2.60	0.521	1.78	3.128	0.626	2.27	8.148	36
	36	2.47	0.493	1.87	3.026	0.605	2.25	7.459	40
Cooling tower	37	3.09	0.619	2.02	3.179	0.636	2.50	9.834	21
	38	3.19	0.637	2.22	3.564	0.713	2.43	11.355	3
	39	3.09	0.619	2.36	3.179	0.636	2.66	9.834	21
	40	2.84	0.567	1.84	3.385	0.677	2.46	9.603	23
	41	2.74	0.549	2.28	2.925	0.585	2.11	8.027	38

Source: Created by the authors

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