Research Article
Extension of Object-Oriented Metrics Suite for Software Maintenance
Table 1
Correlations between metrics.
| (a) Correlations between complexity metrics |
| | Metric | MMC | SDMC | PNC | | System 1 | System 2 | System 3 | System 1 | System 2 | System 3 | System 1 | System 2 | System 3 |
| | WMC | 0.794* | 0.902
*
| 0.873
*
| 0.490* | 0.436* | 0.647* | 0.417* | 0.500* | 0.620* | | NOM | 0.422* | 0.796* | 0.615* | 0.113 | 0.429* | 0.315 | 0.348* | 0.545* | 0.448 | | NLM | 0.312* | 0.888
*
| 0.326 | 0.037 | 0.568* | 0.129 | 0.291* | 0.531* | 0.232 |
|
|
| (b) Correlations between impact metrics |
| | Metric | CI | MNI | | System 1 | System 2 | System 3 | System 1 | System 2 | System 3 |
| | CBO | 0.693* | 0.660* | 0.481 | 0.277* | 0.713* | 0.245 |
|
|
| (c) Correlations between dependence metrics |
| | Metric | CD | MND | | System 1 | System 2 | System 3 | System 1 | System 2 | System 3 |
| | CBO | 0.346* | 0.547* | 0.442 | 0.257* | 0.494* | 0.435 | | MPC | 0.992
*
| 0.939
*
| 0.995
*
| 0.797* | 0.857
*
| 0.974
*
| | CTM | 0.992
*
| 0.939
*
| 0.995
*
| 0.797* | 0.857
*
| 0.974
*
|
|
|
| (d) Correlations between inheritance metrics |
| | Metric | ID | WDI | | System 1 | System 2 | System 3 | System 1 | System 2 | System 3 |
| | DIT | 0.550* | 0.579* | — | — | — | — | | NAC | 0.550* | 0.579* | — | — | — | — | | NOC | — | — | — | 0.336* | 0.186 | — | | NDC | — | — | — | 0.886
*
| 0.186 | — |
|
|
