Difference between revisions of "Dedupe 2.4"

Revision as of 11:15, 2 April 2013

Dedupe 2.4: Group 1 - 008 Date (Verify)

008 date

Verify Date: This is for verifying on the publication date used in the 008 date fields (positions 7-10 and 11-14.

Verify Method

Parameters in this verification allow partial dates to match to either full dates or other partial dates. Different methods are used in this FULL/PARTIAL/WITHIN.

Full

Full compares both date1 and date2 of each record; both must match:

 
 Record A:
       date1 date2
   008 1972  1973
 
 Record B:
       date1 date2
   008 1972  1973

In this example, both date1 (1972) & date2 (1973) of Record A & B match. Matching on Full returns a match for these two records.

Partial

Partial compares date1 of each record. If no match it compares date2 (as long date doesn't contain fill characters--<space> or <pipe>):

 
 Record A:
       date1 date2
   008 1971  1973
 
 Record B:
       date1 date2
   008 1972  1973

Since Record A's date1 (1971) is a mismatch against Record B's date1 (1972), both record's date2 (1973) are considered. Matching on Partial returns a match for these two records.

Within

Within compares date1 of one record to date2 of other record, and vice-versa. If no match it also does a partial verify:

 
 Record A:
       date1 date2
   008 1970  1973
 
 Record B:
       date1 date2
   008 1973  1972

In this example, date1 in Record A (1970) does not match date2 in Record B (1972). So, it checks date2 of Record A (1973) against date1 of Record B (1973). Matching on Within returns a match for these two records.

Tolerance

The date tolerance for the Verify Date parameter is the number of years the date can differ and still qualify as a matched record. This allows for more leniency with hits on the 010/020 and stricter criteria for the TITLE or other fields. The tolerance allows for dates to match within a specified number of years.

Match exactly

The year 1996 can only verify with another record that has the year 1996. It will not match either 1995, 199u, 199-, or 199 (ends with blank).

Off by 1 year

The year 1996 would match either 1995, 1996, or 1997. It would not match 1994, 1998, or years where the ending digit is missing or contains a fill character.

Off by # years

This allows the year tolerance to be increased by the Library for two-plus years. This is helpful when the desired outcome is to match the same decade of the original year in question.

• Although Backstage recommends using the 008 date blocks, if these are missing or considered unreliable, please consult with Backstage staff for using the 260 $c publication date instead.

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