[Xapian-discuss] UTF8 support plans (without stemming)
olly at survex.com
Thu Apr 28 20:06:39 BST 2005
On Thu, Apr 28, 2005 at 04:52:37PM +0100, Sam Liddicott wrote:
> Craig Macdonald wrote:
> >We've had some success in applying
> >only the first two steps of the English (Porter) stemmer
> >to large English web corpuses. Many submissions to last year's TREC
> >Terabyte track didnt use stemming at all.
> > http://www.google.co.uk/search?q=2004+trec+terabyte+stemming
> >It would also appear to be a similar approach to what Google is doing.
> >The first two steps only drops plurals and tense suffixes.
Perhaps it would be useful to have a "porterlite" stemmer which
> When you are looking for enough hits in a near infinite document set the
> drop in recall can be hidden, because the user never knows what they
> miss out on - as long as there are enough results - because they never
> were going to look at all good results anyway.
Indeed - if there are a lot of possible answers, precision matters much
more than recall. Google appears to only automatically turn on stemming
(or synonyms) for "hard" queries, which makes some sense from this point
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