I've been told over and over what Koji said - the convention is that 1.0 is the default center of the boost axis. And the other important thing to know about boost values is that the dynamic range is about 6-8 bits, so use a range of "2.0 4.0 12.0" instead of "100.0 200.0 1200.0".
Lance On Sat, Oct 10, 2009 at 9:07 PM, ragi <raghuveer.kanche...@gmail.com> wrote: > > If you dont want to do a pure negative query and just want boost a few > documents down based on a matching criteria try to use linear function (one > of the functions available in boost function) with a negative m (slope). > We could solve our problem this way. > > > We wanted to do negatively boost some documents based on certain keywords > while > > Marc Sturlese wrote: >> >> >> :>the only way to "negative boost" is to "positively boost" the inverse... >> :> >> :> (*:* -field1:value_to_penalize)^10 >> >> This will do the job aswell as bq supports pure negative queries (at least >> in trunk): >> bq=-field1:value_to_penalize^10 >> >> http://wiki.apache.org/solr/SolrRelevancyFAQ#head-76e53db8c5fd31133dc3566318d1aad2bb23e07e >> >> >> hossman wrote: >>> >>> >>> : Use decimal figure less than 1, e.g. 0.5, to express less importance. >>> >>> but that's stil la positive boost ... it still increases the scores of >>> documents that match. >>> >>> the only way to "negative boost" is to "positively boost" the inverse... >>> >>> (*:* -field1:value_to_penalize)^10 >>> >>> : > I am looking for a way to assign negative boost to a term in Solr >>> query. >>> : > Our use scenario is that we want to boost matching documents that are >>> : > updated recently and penalize those that have not been updated for a >>> long >>> : > time. There are other terms in the query that would affect the >>> scores as >>> : > well. For example we construct a query similar to this: >>> : > >>> : > *:* field1:value1^2 field2:value2^2 lastUpdateTime:[NOW/DAY-90DAYS >>> TO *]^5 >>> : > lastUpdateTime:[* TO NOW/DAY-365DAYS]^-3 >>> : > >>> : > I notice it's not possible to simply use a negative boosting factor >>> in the >>> : > query. Is there any way to achieve such result? >>> : > >>> : > Regards, >>> : > Shi Quan He >>> : > >>> : > >>> >>> >>> >>> -Hoss >>> >>> >>> >> >> > > -- > View this message in context: > http://www.nabble.com/Is-negative-boost-possible--tp25025775p25840621.html > Sent from the Solr - User mailing list archive at Nabble.com. > > -- Lance Norskog goks...@gmail.com
