7 Authoritative Lists

7 Authoritative Lists

7.1 Introduction

An Authoritative List Comparison presents your library's or Subscription Group's holdings compared to authoritative collection development lists, in a spreadsheet-style table called the Analysis Results screen. For a description of screen functions see: section 11.1, "Analysis Results Screen".

Example:

The complete set of available lists is available at: http://www.oclc.org/support/documentation/collectionanalysis/authlists.html.

Comparisons that you create are identified as Authoritative Lists on the Data to Analyze screen.

You must create an Authoritative List Comparison using the WorldCat Services Administrative Module (see chapter 2, Administrative Functions).

Analysis type

Individual institutions.  For libraries subscribing as individual institutions, an Authoritative List Comparison is created between your library's holdings (My Library — the Individual Library Analysis) and the selected list.

Subscription Groups.  For libraries subscribing as part of a Subscription Group, the comparison is created between the group's Aggregated Group Analysis and the selected list.

See section 1.3, "Types of Analysis" for more information about these analysis types.

7.2 Comparison

Defaults

The default Analysis Results screen presents total titles (Totals), unique titles (Unique), and shared titles (Overlap) as the table columns, and your library/group and the selected authoritative list as rows.

The default row expansion order is:

View graph display

You can view a graph of the data from a single row of the analysis table by selecting

the Display Graph  icon. See section 11.2, "Graph Display Screen" for more information.

Changing the analysis

You can vary the order in which dimensions are applied to this analysis by using the Change Analysis screen.

Column values.  For an Authoritative List Comparison the only available column value is List Comparison.

Row expansion.  For row expansion, you may re-order the following dimensions except the one you have selected for the column value:

• Audience
• Division
• Language
• Library vs List

Limiting the analysis

You can reduce the overall results of an analysis by reducing the breadth of one or more of the dimensions. You reduce the breadth by creating subsets of an analysis dimension on the Limit Analysis Screen.

For an Authoritative List Comparison you can select subsets of the following dimensions:

• Library vs List
• Division
• Language
• Audience

View records

To view actual holdings for a given row/column, select the number shown in the corresponding table cell.

Summary bibliographic information is provided as a List of Records screen. Records are ranked by the number of libraries holding the item in WorldCat, in descending order, that is, items held by the most libraries display first on the list.

To...	Do this...
View additional information about the List of Records screen	Select the Help  icon.
View a full record	Select the record title.
Return to the Analysis Results screen	Select the Collection Analysis tab.

7.3 About Multi-Version Records

For an Authoritative List Comparison, WorldCat Collection Analysis groups items of similar intellectual content into a single record; this concept is often referred to as FRBR (see: Functional Requirements for Bibliographic Records - Final Report at http://www.ifla.org/VII/s13/frbr/frbr.htm).

For this comparison, OCLC combines bibliographic information for different editions or formats of given work into a Multi-Version Record. For example, a library that owns a printed edition of Michelangelo & the Pope's ceiling and a library that owns the recorded edition (Recording for the Blind & Dyslexic, 2003) will both match the listing in Booklist. The List of Records screen for this comparison will show the title only once, as a Multi-Version Record.

Most common version

In some cases, an additional title, displayed in green and labeled (most common version), appears when a uniform title is used as the basis for a Multi-Version Record.

Your own holdings

When you select an item's title, WCAS displays the multi-version record. Your own holdings will be listed first within the Matching Versions list.

The remaining items in the Matching Versions list are held in WorldCat by other institutions. These will help you determine whether your version of a title has been superceded by a newer edition and also show you the number of institutions that have purchased the new edition.

7.4 Overlap

An Authoritative List Comparison provides an Overlap view which shows the number of titles that your library or your Subscription Group owns jointly with the selected authoritative collection development list.

For these comparisons Overlap is shown in the List Comparison tab.

Example: Individual institutions

Example: Subscription group

See section 1.7, "Overlap/Uniqueness Implementation" for information on how Overlap totals are counted.

7.5 Uniqueness

An Authoritative List Comparison provides a Uniqueness view which shows the number of titles that your library or Subscription Group owns that are not also owned with the selected authoritative collection development list.

For these comparisons Uniqueness is shown in the List Comparison tab.

Example: Individual institution

Example: Subscription group

See section 1.7, "Overlap/Uniqueness Implementation" for information on how Uniqueness totals are counted.