Subject Correlations Help
   

Contents

INTRODUCTION
The subject correlations database is designed to assist catalogers in assigning classification numbers by answering the following questions:
  1. What are the subject headings most frequently used with a specific classification number?
  2. What are the classification numbers most frequently used with a specific subject heading?
Unlike LC authority subject headings, these are subject headings plus subdivisions, as found in bibliographic records.  The display includes links to the classification browser and to bibliographic records that use a particular classification number.

The subject correlations application is reached by taking the "Subject Correlations" link on the main classification menu.

Looking up subject correlations works the same way as browsing indexes in the classification search system.  You input a classification number or subject into the appropriate field on the screen and click on the corresponding "Find" button.  The server will return either a list of subject headings with their subdivisions, or a list of classification numbers.

STATUS LINE
At the bottom of your Web browser is a status line.  Any time you want to know what a link does in the classification system, move your mouse over the link.   The status line will be filled in with information about the link.
HOW IT WORKS
Subject correlations are created by processing the Library of Congress bibliographic database and locating the first topical subject heading field (650 or 651) in each record.  If a record does not have a 650 or 651 field, it is skipped.  Otherwise, all of the subfields of the chosen 650 or 651 field are combined to create a single subject string (this is the subject plus all of its subdivisions).  This combined subject string plus the bibliographic record's classification number is added to the subject correlations database.  A given bibliographic record will never contribute more than a single entry to the subject correlations database.

When you search the subject correlations database, the system is returning information about the number of bibliographic records with a particular combination of a subject (with its subdivisions) and a classification number.  The results are presented as a "top ten" list -- the ten most common subjects for a given classification number or the ten most common classification numbers for a particular subject.  Each "result" includes the number of times this combination was found in the bibliographic database.

Because the system only returns ten correlations per subject or classification number, you may not find the particular combination you expected.  It doesn't mean it is not in the database, just that it didn't make the "top ten" list.  Also keep in mind that the eleventh entry (not shown) may have the same number of correlations as the tenth (the last entry that is displayed).

SEARCHING BY CLASSIFICATION NUMBER
When you input a value into the classification number field and press its "Find" button, the server will return the page of classification numbers that comes closest to your request.  Each classification number is returned as a link.  When you click on that link, the server will expand the display to include the subject correlations for that classification number.

These are the ten most common subject headings that were used with that classification number in the bibliographic database.  The subjects are listed in descending frequency, with the number of bibliographic records that used that combination of classification number and subject heading displayed in parentheses.

SEARCHING BY SUBJECT
When you input a value into the subject field and press its "Find" button, the server will return the page of subject headings that comes closest to your request.  To search for a subject plus subdivisions, separate each subdivisions with a space, comma or period.  You can also use " -- ".  The following are all equivalent:

    Guilds -- Germany -- History.

    Guilds Germany History

    guilds -- germany - history

    guilds.germany.history

Whether you are index browsing or running a query, Minaret treats almost all punctuation (comma, period, hyphen, dollar sign, parentheses, slash, etc.) as a space and multiple spaces as a single space.  In addition, any leading and trailing spaces (or  punctuation) are ignored. Any punctuation that is not treated as a space is ignored (apostrophe and caret: ' and ^).

This makes it possible to find what you are looking without knowing how the original record was punctuated or formatted.  In classification number indexes the following punctuation is not ignored: colon, hyphen and period.

Finally, index browsing is always case-insensitive.  This means the software does not care if you input your criteria in upper case, lower case or mixed.  Accent marks are also ignored.

Each of the subject headings that is returned is also a link.  When you click on a subject, the server will expand the display to include the classification number correlations for that subject.  These are the ten most common classification numbers that were used with that subject heading in the bibliographic database.  The numbers are listed in descending frequency, with the number of bibliographic records that used that combination of classification number and subject heading displayed in parentheses.

DISPLAY
The subject correlations screen contains up to three different sections, depending on whether there are any records on the page.  The possible sections are:

Navigation and Command Buttons
The navigation buttons that display other pages of search results (first, next, previous and last page commands) are only displayed after you run a search that returns some records.  When you first reach the subject correlations screen, these navigation buttons will not be shown.  The possible navigation and command buttons are:
 
Button Action
|< Returns the first page of search results.
< Returns the previous page of search results.
> Returns the next  page of search results.
>| Returns the last  page of search results.
Reset Clears any values from the input fields on the search screen and resets all display and search options to their default values.
Logout Logs you out of Minaret.
Close Closes the current window.  In cases where the software has opened a new window for you (like when you click on the Search button), you can close the window by clicking on this button.  If the software is not able to close the window because it was opened by hand, the main classification menu is displayed instead.
Home Displays the main classification menu.  This is useful for changing to a different style of classification browser.
Help Displays on-line help in a separate window.

Search Results
This is the list of correlations that are closest to the criteria you input. Additional Links
When a classification number is listed under a subject, that number is a link to the classification browser.  In addition, classification numbers can be followed by a series of letters in square brackets.  These links are used to perform actions related to that particular number.  The possible letters are:
 

Button Action
B Searches for and displays any bibliographic records with this classification number in a separate window.
C Opens the classification browser in a separate window and locates the closest number to this one.

When launching a LC classification browser, keep in mind that the standard browser does not know how to deconstruct a "built" classification number.  A "built" number has been constructed by applying tables to the primary classification data.  Only the enhanced and hierarchy browsers know how to undo this.  The standard browser will get you to the closest classification number without applying any tables.

Search Input Fields
These two fields allow you to search by classification number or subject heading.  For additional information:

Display Options
The only display option allows you to select the number of records to return with each request you submit to the server.

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