Parallel coordinates plotting is one of the most popular methods for multivariate visualization. However, when applied to larger data sets, there tends to be a “black screen problem,” with the screen becoming so cluttered and full that patterns are difficult or impossible to discern. Xie and Matloff (2014) proposed remedying this problem by plotting only the most frequently-appearing patterns, ...

Funnel plots are a visual tool for investigating publication and other bias in meta-analysis. They are simple scatterplots of the treatment effects estimated from individual studies (horizontal axis) against a measure of study size (vertical axis). The name “funnel plot” is based on the precision in the estimation of the underlying treatment effect increasing as the sample size of component stu...

Scatter plots are mostly used for correlation analysis, but are also a useful tool for understanding the distribution of high-dimensional point cloud data. An important characteristic of such distributions are clusters, and scatter plots have been used successfully to identify clusters in data. Another characteristic of point cloud data that has received less attention so far are regions that c...

This writing discusses the appearance of peaks and valleys in Allan deviation plots (also known as sigma-tau, root Avar, or Adev plots). This distinctly oscillatory pattern, especially at long-term T-values, usually means the presence of quasi-sinusoidal frequency modulation of an oscillator’s signal. However, quasi-sinusoidal oscillatory behavior in sigma-tau plots at long 7 may be due t o sta...

In a previous article, we introduced a number of visualization techniques that we had developed for monitoring the dynamics of artificial competitive coevolutionary systems. One of these techniques involves evaluating the performance of an individual from the current population in a series of trials against opponents from all previous generations, and visualizing the results as a 2D grid of sha...

You don't hear a lot of Henry Luce stories around here now. I heard my first one during a job interview 9 1/2 years ago. Dick Stolley, one of Time Inc.'s editorial viceroys, had suggested that FORTUNE might suit me; I'd offered as how I liked reading about business but didn't know a whole lot about it. No matter, said Stolley: “Luce used to say it's easier to teach a poet how to read a balance ...

The antiaggregation pheromone verbenone was operationally tested for 5 yr to deter mass attack by the mountain pine beetle on lodgepole pine in campgrounds and administrative areas surrounding RedÞsh and Little RedÞsh Lakes at the Sawtooth National Recreation Area in central Idaho. Each year, Þve-gram verbenone pouches were evenly distributed ( 10 m apart) within seven of 14 0.2-ha plots. Durin...