People lie, mislead, and bullshit in a myriad of ways. Visualizations, as a form of communication, are no exception to these tendencies. Yet, the language we use to describe how people can use visualizations to mislead can be relatively sparse. For instance, one can be “lying with vis” or using “deceptive visualizations.” In this paper, we use the language of computer security to expand the spa...

Size-constrained clustering (SCC) refers to the dual problem of using observations to determine latent cluster structure while at the same time assigning observations to the unknown clusters subject to an analyst defined constraint on cluster sizes. While several approaches have been proposed, SCC remains a difficult problem due to the combinatorial dependency between observations introduced by...

Many classical puzzles involve hats. The general setting for these puzzles is a game in which several players are each given a hat to wear. Associated with each hat is either a color or a number. Every player can see the color or number of everyone else’s hat but not his own. The players are then trying to figure out the colors or the numbers on their own hats. The Three-Hat Problem is one of s...

This project will discuss hat problems and the Axiom of Choice. A basic example of a …nite hat problem is helpful in introducing the concept. Assume that there are two players and two possible hat colors, red and blue. The players will be given a certain amount of time before the game begins to communicate and create a strategy for determining their own hat colors. After this initial strategy s...

This paper examines three methods of mapping of biodiversity using point-occurrence data for the birds of Mexico: aggregation of species occurrence records, vegetation surrogate, and individual species models. We compare the approaches from the perspective of achieving potential gains in spatial resolution with existing data. We found that mapping the diversity of Mexican birds using individual...

N distinguishable players are randomly fitted with a white or black hat, where the probabilities of getting a white or black hat may be different, but known and the same to all the players. All players guess simultaneously the color of their own hat observing only the hat colors of the other N − 1 players. The team wins if all players guess right. No communication of any sort is allowed, except...

In process identification (i.e., dynamic model development) information on the precision and reliability of a parameter estimate is conveyed y a confidence interval. The best confidence interval is the one with the shortest width for a given level of confidence. Confidence intervals iden as the standard error increases or as the number of estimated parameters increases. When the value of a para...

Acetylation of proteins by p300 histone acetyltransferase plays a critical role in the regulation of gene expression. The prior discovery of an autoacetylated regulatory loop in the p300 histone acetyltransferase (HAT) domain prompted us to further explore the mechanisms of p300 autoacetylation. Here we have described a kinetic and mass spectrometric analysis of p300 HAT autoacetylation. The ra...

Charge-transfer (CT) π-complexes are formed between planar porphyrins and 1,4,5,8,9,12-hexaazatriphenylene (HAT) derivatives with large formation constants (e.g., 104 M-1), exhibiting broad CT absorption bands. The unusually large formation constants result from close face-to-face contact between two planar π-planes of porphyrins and HAT derivatives. The redox potentials of porphyrins and HAT d...