| X̅gj = | mean nursing cost per case for DRGg in hospitalj; |
| = | total nursing costs for patients 1 to N in DRGg for hospitalj; |
| Ngj = | number of cases in DRGg in hospitalj. |
| X̅gj = | mean nursing cost per case for DRGg in hospitalj; |
| = | total nursing costs for patients 1 to N in DRGg for hospitalj; |
| Ngj = | number of cases in DRGg in hospitalj. |