Research Article
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% |
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