In this paper we present a new simple method to rewrite a given input string into another one which can be efficiently compressed (in some cases) by traditional compression methods. Key-Words:Data compression, Reversible transformation

Function discovery is the problem of nding a symbolic formula for a function f : D1!D2 from a set of examples f(x; y) j y = f(x)g D1 D2. Acceptable solutions are restricted to formulas expressible in some given description language L. In most previous discovery systems|for example, Bacon [4], Abacus [1], Coper [2], Fahrenheit [3] and IDS [5]|the description language is restricted to contain onl...

This paper presents a system for declaratively transforming medical subjects' data into a common data model representation. Our work is part of the "GAAIN" project on Alzheimer's disease data federation across multiple data providers. We present a general purpose data transformation system that we have developed by leveraging the existing state-of-the-art in data integration and query rewriting...

Change detection (CD) in time series data is a critical problem as it reveal changes in the underlying generative processes driving the time series. Despite having received significant attention, one important unexplored aspect is how to efficiently utilize additional correlated information to improve the detection and the understanding of changepoints. We propose hierarchical quickest change d...

Jahanshahloo et al. (Appl Math Comput 153:215–224, 2004) propose a method for ranking extremely efficient decision making units (DMUs) in data envelopment analysis (DEA) using super-efficiency technique and l1-norm and they show that the presented method is able to eliminate the existing difficulties in some methods. This paper suggests an alternative transformation to convert the nonlinear mod...

Parturition and mortality annual rates are basic data for quantifying productivity of livestock populations in tropical extensive farming systems (14, 18, 23, 26). These parameters are estimated from data collected in the field. In developing countries, collecting data is a difficult task due to the dispersion and mobility of the herds and the fact that farmers do not keep written records about...

This paper investigates the possibility of embedding extensive-form crisis bargaining games directly into empirical tests of these interactions. Given a game structure and data on the relative frequency of the possible outcomes, what can we infer about the distribution of payoffs and, by extension, the effect of covariates (e.g., military capabilities, regime types, etc.) on those payoffs? We s...

The process of transforming and integrating XML data involves resolving the syntactic, semantic and schematic heterogeneities that the data sources present. Moreover, there are a number of different application settings in which such a process could take place, such as centralised or peer-to-peer settings, each of which needs to be considered separately. In this thesis, we investigate the probl...