An Analytical Framework of a Deployment Strategy for Cloud Computing Services: A Case Study of Academic Websites

Table 10

The probability distributions of RIAT obtained from NCTU records.

RIAT (sec/request)	PDF of ED (𝐸)	PDF of RD (𝑂)	CDF of ED	CDF of RD	(𝐸−𝑂)^2/𝐸
[0, 1]	67.386%	95.665%	67.386%	95.665%	0.1187
(1, 2]	21.977%	3.474%	89.363%	99.139%	0.1558
(2, 3]	7.168%	0.412%	96.531%	99.550%	0.0637
(3, 4]	2.338%	0.173%	98.869%	99.724%	0.0200
(4, 5]	0.762%	0.074%	99.631%	99.797%	0.0062
(5, 6]	0.249%	0.045%	99.880%	99.842%	0.0017
(6, 7]	0.081%	0.035%	99.961%	99.877%	0.0003
(7, 8]	0.026%	0.019%	99.987%	99.896%	0.0000
(8, 9]	0.009%	0.015%	99.996%	99.911%	0.0000
(9, 10]	0.003%	0.012%	99.999%	99.923%	0.0003
(10, 11]	0.001%	0.009%	100.000%	99.933%	0.0008
(11, 12]	0.000%	0.010%	100.000%	99.942%	0.0030
(12, infinite)	0.000%	0.058%	100.000%	100.000%	0.3400
Summary					0.7105