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Estimation and testing the effect of covariates in accelerated life time models under censoring
(2010)
The accelerated lifetime model is considered. To test the influence of the covariate we transform the model in a regression model. Since censoring is allowed this approach leads to a goodness-of-fit problem for regression functions under censoring. So nonparametric estimation of regression functions under censoring is investigated, a limit theorem for a L2-distance is stated and a test procedure is formulated. Finally a Monte Carlo procedure is proposed.
Computer games may be defined as artifacts that connect the input devices of a computer (such as keyboard, mouse or controller) with its output devices (in most cases a screen and speakers) in such a way that on the screen a challenge is displayed. On the screen we see pictorial elements that have to be manipulated to master a game, that is to win a competition, to solve a riddle or to adopt a skill. Therefore the characteristics of the representational function of computer games have to be contrasted phenomenologically with conventional games on the one hand and cinematic depictions on the other. It shows that computer games separate the player from the playing field, and translate bodily felt concrete actions into situational abstract cinematic depictions. These features add up to the situational abstract presentation of self-action experience. In this framework computer games reveal a potential as a new means of shared cognition that might unfold in the 21st century and change the beingin- the-world in a similar way as cinematic depiction did in the 20th century
Persistence of stock returns is an extensively studied and discussed theme in the analysis of financial markets. Antipersistence is usually attributed to volatilities. However, not only volatilities but also stock returns can exhibit antipersistence. Antipersistent noise has a somewhat rougher appearance than Gaussian noise. Heuristically spoken, price movements are more likely followed by movements in the opposite direction than in the same direction. The pertaining integrated process exhibits a smaller range – prices seem to stay in the vicinity of the initial value. We apply a widely used test based upon the modified R/S-Method by Lo [1991] to daily returns of 21 German stocks from 1960 to 2008. Combining this test with the concept of moving windows by Carbone et al. [2004], we are able to determine periods of antipersistence for some of the series under examination. Our results suggest that antipersistence can be found for stocks and periods where extraordinary corporate actions such as mergers & acquisitions or financial distress are present. These effects should be properly accounted for when choosing and designing models for inference.