W. Bruce Croft

A Language Modeling Approach to Information Retrieval

Models of document indexing and document retrieval have been extensively studied. The integration of these two classes of models has been the goal of several researchers but it is a very difficult… (More)

A Markov random field model for term dependencies

This paper develops a general, formal framework for modeling term dependencies via Markov random fields. The model allows for arbitrary text features to be incorporated as evidence. In particular, we… (More)

Searching Distributed Collections with Inference Networks

James P. Callan, Zhihong Lu, W. Bruce Croft
SIGIR
1995

The use of information retrieval systems in networked environments raises a new set of issues that have received little attention. These issues include ranking document collections for relevance to a… (More)

LDA-based document models for ad-hoc retrieval

Search algorithms incorporating some form of topic model have a long history in information retrieval. For example, cluster-based retrieval has been studied since the 60s and has recently produced… (More)

Predicting query performance

Stephen Cronen-Townsend, Yun Zhou, W. Bruce Croft
SIGIR
2002

We develop a method for predicting query performance by computing the relative entropy between a query language model and the corresponding collection language model. The resulting clarity score… (More)

Deriving Concept Hierarchies from Text

Abstract : This paper presents a means of automatically deriving a hierarchical organization of concepts from a set of documents without use of training data or standard clustering techniques.… (More)

Query Expansion Using Local and Global Document Analysis

Indri: A language-model based search engine for complex queries1

Trevor Strohman, Donald Metzler, Howard R. Turtle, W. Bruce Croft
2005

Information Filtering and Information Retrieval: Two Sides of the Same Coin?

Information filtering systems are designed for unstructured or semistructured data, as opposed to database applications, which use very structured data. The systems also deal primarily with textual… (More)

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