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Recent analysis in chatter modelling of BTA deep-hole drilling consisted in phenomenological modelisation of relationships between the observed time series and appearance of chatter during the process. Using the newly developed MEWMA control chart [4, 5], it has even been possible to predict the...
Persistent link: https://www.econbiz.de/10003354923
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Proprietors are an important group of stockholders and non-diversifiable entrepreneurial risk could therefore help explain time-varying risk premia on the aggregate stock market. This paper suggests an entrepreneurial distress factor that is highly correlated with the aggregate...
Persistent link: https://www.econbiz.de/10003355063
The Monod model is a classical microbiological model much used in microbiology, for example to evaluate biodegradation processes. The model describes microbial growth kinetics in batch culture experiments using three parameters: the maximal specific growth rate, the saturation constant and the...
Persistent link: https://www.econbiz.de/10003355230
RFreak is an R package providing a framework for evolutionary computation. By enwrapping the functionality of an evolutionary algorithm kit written in Java, it offers an easy way to do evolutionary computation in R. In addition, application examples where an evolutionary approach is promising in...
Persistent link: https://www.econbiz.de/10003835935
For a time-continuous discrete-state Markov process as model for rating transitions, we study the time-stationarity by means of a likelihood ratio test. For multiple Markov process data from a multiplicative intensity model, maximum likelihood parameter estimates can be represented as martingale...
Persistent link: https://www.econbiz.de/10003837749
One serious problem in deep hole drilling is the occurrence of a dynamic disturbances called spiralling. A common explanation for the occurrence of spiralling is the coincidence of time varying bending eigenfrequencies of the tool with multiples of the spindle rotation frequency. We propose a...
Persistent link: https://www.econbiz.de/10003483072
The paper considers the problem of non-parametric regression with emphasis on controlling the number of local extrema. Two methods, the run method and the taut string-wavelet method, are introduced and analysed on standard test beds. It is shown that the number and location of local extreme...
Persistent link: https://www.econbiz.de/10009793269
Ecological, toxicological, and pharmacological research is often concerned with the answer to the question of how a substance is processed within a biological system. The exact knowledge of the corresponding kinetic pattern forms the basis for a useful answer. In order to identify non-linear...
Persistent link: https://www.econbiz.de/10010467697
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