1. A method of information retrieval comprising: (a) receiving from a user, data identifying a stored reference corpus; (b) retrieving the identified reference corpus from storage; (c) generating initial values of respective weights corresponding to a plurality of analysis algorithms by processing the retrieved reference corpus in accordance with a predetermined algorithm; (d) retrieving from storage another text document as a candidate document; (e) performing respective comparisons between the candidate document and the reference corpus in accordance with each of said analysis algorithms and producing respective comparison results; (f) generating corresponding weighted comparison results by multiplying each said comparison result by its respective weight; (g) summing the weighted comparison results to produce a dissimilarity measure that is indicative of the degree of dissimilarity between the retrieved reference corpus and the retrieved candidate document; and (h) storing the candidate document in a retained text store if said sum is indicative of a degree of dissimilarity less than a predetermined degree of dissimilarity.
1. A method of information retrieval comprising: (a) receiving from a user, data identifying a stored reference corpus; (b) retrieving the identified reference corpus from storage; (c) generating initial values of respective weights corresponding to a plurality of analysis algorithms by processing the retrieved reference corpus in accordance with a predetermined algorithm; (d) retrieving from storage another text document as a candidate document; (e) performing respective comparisons between the candidate document and the reference corpus in accordance with each of said analysis algorithms and producing respective comparison results; (f) generating corresponding weighted comparison results by multiplying each said comparison result by its respective weight; (g) summing the weighted comparison results to produce a dissimilarity measure that is indicative of the degree of dissimilarity between the retrieved reference corpus and the retrieved candidate document; and (h) storing the candidate document in a retained text store if said sum is indicative of a degree of dissimilarity less than a predetermined degree of dissimilarity. 4. A method as in claim 1, including the steps of: presenting to the user, for each of a plurality of candidate documents stored in the retained text store, the respective dissimilarity measures and respective links to said plurality of stored retrieved texts, receiving from the user an allocated relevance value R in respect of a presented dissimilarity measure, and modifying said weights by multiplying each weight (Wi) by a respective weight factor (1+ki), where ki is a function of the contribution that the respective weighted comparison result makes to the dissimilarity measure, and the value of R-Rmean, where Rmean is the mean of lowest and highest possible relevance values.