11. The search system of claim 10 wherein said documents are in different subgroups, sg.sub.p of the group, g, where g=sg.sub.1, sg.sub.2, . . . ,sg.sub.j, . . . ,sg.sub.G and the scoring is performed separately for each subgroup j using the statistics of the master subgroup, g, where score, score(Sn.sub.g).sub.Q {sg.sub.j }, for the particular document Sn.sub.g for a particular one subgroup {sg.sub.j } is determined as follows, ##EQU6## where W.sub.Qp {sg.sub.j }=the weighted value for the query collectively considering all the Nsg.sub.j documents in the subgroup sp.sub.j.
10. A collection search system responsive to a user query, Q, for searching against a collection of documents, where each document is described as a string of words, S, where for an M-word document, S=S.sub.1, S.sub.2,S.sub.3, . . . ,S.sub.m,S.sub.m+1,S.sub.m+2,S.sub.m+3, . . . ,SM, where m=1,2, . . . , M, where for a number, N.sub.g, of documents in a group g of documents in the collection, the documents are designated S1.sub.g,S2.sub.g, . . . ,Sn.sub.g, . . . ,SN.sub.g for n.sub.g =1,2, . . . , N.sub.g, and where a typical predetermined document, Sn.sub.g, of said documents in the group g is given by, Sn.sub.g =Sn.sub.g,1,Sn.sub.g,2,Sn.sub.g,3, . . . ,Sn.sub.g,m3 Sn.sub.g,m+1,Sn.sub.g,m+2,Sn.sub.g,m+3, . . . ,Sn.sub.g,Mm, said collection search system comprising: a collection index including first predetermined one-word and two-word phrases as indexed terms occurring in said collection of documents; a linguistic parser that identifies from the user query, Q, a list of search terms Q.sub.1, Q.sub.2, . . . , Q.sub.p, . . . , Q.sub.p each having a weighted value, W.sub.Q1,W.sub.Q2, . . . ,W.sub.Qp3 . . . , WQP, said linguistic parser identifying said list of search terms from second predetermined one-word and two-word phrases; and a search engine coupled to receive said list from said linguistic parser, said search engine intersecting said list with said collection index to identify the predetermined document Sn.sub.g from said collection of documents, said search engine including an accumulator for summing for said predetermined document a relevancy score, score(Sn.sub.g).sub.Q, for the document Sn.sub.g based on the query Q as follows: ##EQU5## where (A.sub.Ng).sub.Qp =a document value relative to the number of occurrences of the term Qp in the documents in the group g, where W.sub.Qp =the value of the query term relative to the number of occurrences of the term Qp in the particular document Sn.sub.g.