We have developed a technique for authoring a nonlinear plot and for managing a story according to the plot in an interactive story-based virtual reality application. The technique exploits Petri Nets that alter reactive plans controlling individual actors. Its main advantage is that it allows for iterative design and copes with large virtual worlds inhabited with tens of actors. In this paper,...

Count data arise in numerous fields of interest. Analysis of these data frequently require distributional assumptions. Although the graphical display of a fitted model is straightforward in the univariate scenario, this becomes more complex if covariate information needs to be included into the model. Stratification is one way to proceed, but has its limitations if the covariate has many levels...

The increasing complexity of interactive applications and crescent demand for educational systems aggravates the urge for a balance between interactivity and scripted content. Approaches to this problem have ranged from a focus on interactivity and emotional engagement to linear narratives, with limited interactive capacities. The introduction of non-linearity frequently imposes a heavy burden ...

The snowflake plot is a scatter plot that displays relative timings of three neurons. It has had rather limited use since its introduction by Perkel, Gerstein, Smith, and Tatton (1975), in part because its triangular coordinates are unfamiliar and its theoretical properties are not well studied. In this letter, we study certain quantitative properties of this plot: we use projections to relate ...

In a recent paper, Monlezun and Blouin (1988) proposed an analysis of covariance for a split plot experiment. They suggest a model consisting of five regression coefficients, one for each of the effects whole-plot treatment means, whole-plot errors, split plot-treatment means, whole-plot and split-plot treatment interactions and the experimental errors. In this paper we critically examine the a...

estimates of quantities, such as per acre volume, within conditions of interest. If the plot is half natural pine and half plantation pine, it is clear that the combined plot data are not representative of either condition. The most important mapped plot assumption made explicit in Equation 1 is that the expected amount of y on a partial plot is proportional to a. In particular, if half the plo...

BACKGROUND The divergent glacial histories of southern and northern Europe affect present-day species diversity at coarse-grained scales in these two regions, but do these effects also penetrate to the more fine-grained scales of local communities? METHODOLOGY/PRINCIPAL FINDINGS We carried out a cross-scale analysis to address this question for vascular plants in two mountain regions, the Alp...