Similarity Scoring Rules
| Description | Q similar | Q identical |
| Differences in the ‘missing/not applicable’ categories only |  |  |
| Differences in the number of identifier coding levels |  |  |
| Differences in number of coding levels for count values |  |  |
| Imputation indicator v LS with no imputation indicators used |  | |
| Variables based on ‘tick all that apply’ census questions where one LS has all answers combined into one variable and another with a separate variable for each applicable category | | |
| No equivalent variable match between LSs (either because no equivalent variable was derived or there was no equivalent question on census) | | |
| Distance variables rounded to different decimal places | | |
| 1991 Variables only coded to 10% v equivalent variable coded to 100% | | |
| Postcodes/output areas etc: enumeration address |  |  |
| Postcodes/output areas etc: previous address/place of work | | |
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