Stemming determines the suffixes of words and allows you
to search for the term as entered, the root word, and other words formed
with other possible suffixes. For example, if you enter the term
you get results for the following:
Autostemming provides you with much broader search results as the system stems all search terms except for author names and words in quotation marks and/or braces. You do not need to search for all the variations of the terms in your search query as they are provided in the results.
Autostemming is available in Quick and Expert searches.
Autostemming can be used with proximity operators since all of the terms are automatically stemmed.
electric ONEAR/0 guitars finds the following results:
Autostemming does not find variants between British and American spellings.
color does not find
colour will find
To be inclusive, in this case you would need to search for
color or colour.
In order to improve the precision of stemming results, you can apply stemming to specific terms in your search query rather than to allow the autostemming feature to stem all terms except author names and words in double quotation marks and/or braces.
For example $electric $motor finds the following results:
electric motor, electrical motors, motor and electrically driven vehicle etc.
However, $electric motor finds the following results:
electric motor and electrical motor, but not
electric motors or electrical motors
as the word motor is not stemmed in this case.
You cannot use proximity operators with stemming unless all the terms are stemmed. There will be inconsistent search results if only specific search terms are stemmed in a search query.
For example, $control ONEAR/0 drug or control ONEAR/0 $drug will provide inconsistent search results because not all of the search terms are stemmed in these cases.
In order to provide consistent search results, autostemming must be enabled, or the search query must have all terms stemmed.
For example $control ONEAR/0 $drug will produce consistent search results as both search terms are stemmed.
Using truncation or wildcards turns off the autostemming feature. If you want your results stemmed when using truncation or wildcards, use the dollar sign ($) to manually stem each search term in your query.
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