Editing Spell checker (section)

==Context-sensitive spell checkers==
There has been research on developing algorithms that are capable of recognizing a misspelled word, even if the word itself is in the vocabulary, based on the [[context (language use)|context]] of the surrounding words. Not only does this allow words such as those in the poem above to be caught, but it mitigates the detrimental effect of enlarging dictionaries, allowing more words to be recognized. For example, ''[[baht]]'' in the same paragraph as ''Thai'' or ''Thailand'' would not be recognized as a misspelling of ''bath''. The most common example of errors caught by such a system are [[homophone]] errors, such as the bold words in the following sentence:
:'''Their''' coming '''too''' '''sea''' if '''its''' '''reel'''.

The most successful algorithm to date is Andrew Golding and Dan Roth's "[[Winnow (algorithm)|Winnow]]-based  spelling correction algorithm",<ref>{{cite journal |title=Journal Article |journal= Machine Learning|volume=34 |pages=107–130 |publisher=SpringerLink |doi=10.1023/A:1007545901558 |year=1999 |last1=Golding |first1=Andrew R. |last2=Roth |first2=Dan |doi-access= |s2cid= 12283016}}</ref> published in 1999, which is able to recognize about 96% of context-sensitive spelling errors, in addition to ordinary non-word spelling errors. Context-sensitive spell checkers appeared in the now-defunct applications [[Microsoft Office 2007]]<ref>{{cite news |url=https://www.wsj.com/articles/SB116786111022966326 |title=Review |author=Walt Mossberg |date= 4 January 2007|publisher=Wall Street Journal |access-date=24 September 2010}}</ref> and [[Google Wave]].<ref>{{cite web |url=http://googlesystem.blogspot.com/2009/05/googles-context-sensitive-spell-checker.html |title=Google Operating System  |date=29 May 2009 |publisher=googlesystem.blogspot.com |access-date=25 September 2010}} {{cite web |url=http://googlesystem.blogspot.co.uk/2009/05/googles-context-sensitive-spell-checker.html|title=Google's Context-Sensitive Spell Checker |date=May 29, 2009 |access-date=25 September 2010}}</ref>

[[Grammar checker]]s attempt to fix problems with grammar beyond spelling errors, including incorrect choice of words.