Risk Level Assessment in Construction Projects Using the Schedule Performance Index

Table 3

Statistics for the SPI.

Group	Statistics	SPI3	SPI6	SPI9	SPI12
All projects		19	19	19	19
	Average	0.8113	0.7985	0.7544	0.7078
	Variance	0.3392	0.3326	0.2957	0.3011
	Coefficient of variation	41.8131%	41.6509%	39.1985%	42.5332%
Delayed		15	15	15	15
	Average	0.7543	0.7304	0.6763	0.6139
	Variance	0.3617	0.2958	0.2774	0.2505
	Coefficient of variation	47.9535%	40.4958%	41.0208%	40.8064%
Without delay		4	4	4	4
	Average	1.0250	1.0538	1.0474	1.0602
	Variance	0.0523	0.3812	0.1437	0.2032
	Coefficient of variation	5.1015%	36.1692%	13.7161%	19.1666%