Why and when the analytical entries are made ? Explain with examples how author analytical entries are made in dictionary catalogue?

Description an entry in a catalog that describes a part of a larger work that is also described in the catalog.AACR-1 defines dictionary catalogue as 'a catalogue in which all the entries (author, title, subject, series etc) and their related references are arranged together in one general alphabet.In archival cataloging, analytical entries may be made for series or items within a collection. In bibliographic cataloging, analytical entries may be made for chapters of books, and special issues of or articles in periodicals.an entry in a library catalog that locates a specific part of a more general work or collection (as the treatment of one specific subject in a book)An Analytics Catalog is an important tool to improve governance, usability and engagement for Business Intelligence. It acts as the enterprise data catalog for your business users and provides the following critical capabilities: Users access all reports and dashboards from a single consistent interface.Entry, Main Entry, Added Entries, Cross Reference Entry, Book Index Entry, Class Index Entry, Cross Reference Index Entry. Main entry is the basic entry and it gives the maximum information about the bibliographical details of the document being catalogued. Analytics is a field of computer science that uses math, statistics, and machine learning to find meaningful patterns in data. Analytics – or data analytics – involves sifting through massive data sets to discover, interpret, and share new insights and knowledge.

Sometimes we may wish to draw the attention of a library user to a part or parts of a book which we feel may otherwise escape the attention of the user. A catalogue entry can help in such situations. On such occasions we are analysing the contents of the work. Analysis, AACR-2 observes, "is the process of preparing a bibliographic record that describes a part or parts of a larger item". And, glossary in AACR-2 defines an Analytical Entry as "An entry for a part of an item for which a comprehensive entry has been made".  

1. An entry for a part of an item for which a comprehensive entry is also made
2. separating something into component parts or constituent elements
3. distinguishing the component parts of something so as to discover it true nature or inner relatshionships.

Analytics = a full bibliographic record.

Any time each separate physical piece of a set (defined number of vols to be published) or a series (indefinite) has a unique title and a method of numbering printed on the item, create a full bibliographic record or "analytics".

For a set, the note 590 ANALYTICS PER CONTENTS is added to the record and the items are given the same call number with the addition of holdings in the 050/090.

For a series that is numbered create analytics by making a separate full bib record for each title. The first time the series is added to the collection, follow instructions found in the authority record on OCLC to determine whether to catalog as s(eparate) or c(collection) and use the call number on the authority record. Create a main entry record and add the 590 ANALYTICS PER CONTENTS note and create a record for the separate item. Link the item record (barcode) to the individual item BIB ID and to the main entry BIB ID. If there is not an authority record and/or main entry record, the decision will be made by the Principal Cataloger. The Principal cataloger will determine if the topic will result in very similar call numbers and/or very similar subject headings or not. If so they items will be cataloged and classed together to assist patron use. The Principal Cataloger will catalog the main entry and first analytic and create a serial checkin record for series decision. Subsequent issues, will be given the same call number including the holding for that item and be linked to the main entry record.