Example of calculating a re-weighted Index of Multiple Deprivation 2000 (IMD) score for two 1991 wards
| 1991 ward code | 1998 ward code | Weight* | IMD score of 1998 ward | Weight×IMD score of 1998 ward | Re-weighted 1991 ward IMD score† |
|---|---|---|---|---|---|
| *Weights are derived from The UK Look-up Tables facility based on the ONS All Fields Postcode Directory,12 and quantify the degree of population overlap between the 1998 and 1991 sets of wards. In this example, the 1991 ward DCFA comprises 93.6% of the households from the 1998 ward 00HAMA; 0.7% of the households from the 1998 ward 00HAMD and 0.1% of the households from the 1998 ward 00HAMR. †The re-weighted IMD score for each 1991 ward is the sum of the weighted scores from the component 1998 wards. The 1991 ward DCFA therefore received a new score comprising the sum of 93.6% of the IMD score for ward 00HAMA, 0.7% of the score for ward 00HAMD and 0.1% of the score for ward 00HAMR. | |||||
| DCFA | 00HAMA | 0.9365 | 25.24 | 23.64 | 23.69 |
| 00HAMD | 0.0068 | 4.92 | 0.03 | ||
| 00HAMR | 0.0010 | 22.07 | 0.02 | ||
| DCFB | 00HAMA | 0.0503 | 25.24 | 1.27 | 6.1 |
| 00HAMC | 0.0006 | 7.77 | 0.00 | ||
| 00HAMD | 0.9777 | 4.92 | 4.81 | ||
| 00HAMK | 0.0004 | 20.67 | 0.01 | ||
| 00HANN | 0.0009 | 8.98 | 0.01 | ||