A MCMC algorithm to fit a general exchangeable model

Consider the exchangeable Bayesian hierarchical model where observations y_i are independently distributed from sampling densities with unknown means, the means µi, are a random sample from a distribution g, and the parameters of g are assigned a known distribution h. A simple algorithm is presented for summarizing the posterior distribution based on Gibbs sampling and the Metropolis algorithm. The software program Matlab is used to implement the algorithm and provide a graphical output analysis. An binomial example is used to illustrate the flexibility of modeling possible using this algorithm. Methods of model checking and extensions to hierarchical regression modeling are discussed.     

Modified cramer-von mises and anderson-darling tests for weibull distributions with unknown location and scale parameters

The standard Cramer-von Mises and Anderson-Darling goodness-of-fit tests require continuous underlying distributions with known parameters. In this paper, tables of critical values are generated for both tests for Weibull distributions with unknown location and scale parameters and known shape parameters. The powers of the Cramer-von Mises, Anderson-Darling, Kolmogorov-Smirnov, and Chi-Square tests for this situation are investigated. The Cramer-von Mises test has most power when the shape is 1.0 and the Anderson-Darling test has most power when the shape is 3.5. Finally, a relation between critical value and inverse shape parameter is presented.     

The 1960s: A decade of progress for blacks?

Between 1960 and 1970 blacks, as well as whites, improved their socioeconomic status. Among both races, educational attainment increased, the occupational distribution was upgraded, and real purchasing power rose markedly. In almost every comparison, the gains were somewhat greater among blacks than among whites and thus most indicators of racial differentiation declined. Nevertheless, the changes of this decade failed to eliminate racial differences with regard to socioeconomic status. In all comparisons, except for the income of certain groups of women, blacks were at a disadvantage when compared to whites both at the start and at the end of this decade, and very large racial differences remain. Further socioeconomic progress by blacks during the 1970s will probably not eliminate racial differences. The article concludes by relating the socioeconomic trends to such other aspects of race relations as integration, governmental policy, and the attitudes of whites and blacks.     

Communication problems in the intensive care unit

Hospitalization in an intensive care unit is often physically uncomfortable and socially disorganizing. The ordinary forms of conversational participation that generate and sustain a sense of agency are breached when the patient cannot communicate in socially consensual “real time.” Using my own experience in an intensive care unit, I describe how delayed speech, through the use of an alphabet board, frequently leads to a host of interactional problems and mutual accusations about character. I attempt to show that the fabric of self and the perception of quality of care are achieved through “real time” communication. I also describe the differential communicative structure of those who will not and those who will use my alphabet board. Those using the board exhibit, through board employment and through the “local” topics discussed, a depth of common culture between them and me.