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Masqueraders in computer intrusion detection are people who use somebody else's computer account. We investigate a number of statistical approaches for detecting masqueraders. To evaluate them, we collected UNIX command data from 50 users and then contaminated the data with masqueraders. The experiment was blinded. We show results from our methods and two… (More)

- Matthias Schonlau, Martin Theus
- Inf. Process. Lett.
- 2000

- Martin Theus, Simon Urbanek
- Computer science and data analysis series
- 2009

A method for computer intrusion detection is proposed. It uses command-level data and is based on structural zeroes of user/command contingency tables. More specifically , it is based on commands that have non-zero entries for very few users. Hence it deals with a portion of the data that statistical methods usually ignore. The importance of structural… (More)

We consider visual methods based on mosaic plots for interpreting and modeling categorical data. Categorical data are most often modeled using loglinear models. For certain loglinear models, mosaic plots have unique shapes that do not depend on the actual data being modeled. These shapes reflect the structure of a model, defined by the presence and absence… (More)

- Claudius Coenen, Martin Theus, Ulrich Theus
- Biomedizinische Technik. Biomedical engineering
- 1992

Unlike other electrophysiological measurements such as electrocardiography (ECG) and electroencephalography (EEG), the cutaneous measurement of the electrical activity of the stomach (electrogastrography, EGG) is not an established clinical diagnostic procedure. To overcome common problems in acquiring very-low-frequency signals in the presence of large and… (More)

Dealing with missing values is inconvenient in many ways. Although every statistician has to admit that the structure of missing values can be very meaningful for the interpretation of data, neither statistical software nor statistical theory can deal with missing values in a convincing way. Interactive Statistical Graphics offer a possibility of getting… (More)

- Martin Theus
- 1996

- Martin Theus
- 1998

- Martin Theus
- 2001

Dataming is obviously a ”buzzword”, which does not really describe an academic discipline, but more a field of application of the established disciplines statistics and computer science. Both disciplines do not really cover what dataminers need and lack a certain part. This paper trys to illustrate what the traditional disciplines miss and why new pseudo… (More)