A probabilistic model for interactive retrieval is presented. Bayesian statistical decision theory principles are applied: use of prior and sample information about the relationship of document descriptions to query relevance; maximization of expected value of a utility function, to the problem of optimally restructuring search strategies in an…

Earlier Analyses are shown to involve special cases of the equations developed here; also that a general four-state chain has the same parameter space as an all-or-none model if and only if its representation with an observable absorbing state is lumpable into a Markov chain with three states. (Author/GS)

The author presents a syllabus for an introductory (first year after high school) course in statistics and probability and some methods of teaching statistical techniques. The description comes basically from the procedures used at the Indian Statistical Institute, Calcutta. (JG)

Results of using platonic solids for probability experiments are presented. (JG)

Examines Weir's hypothesis of a U-shaped relationship between age and terminal level of correct responding; studies use of alternation patterning as a response strategy; investigates extent to which immediate reinforcement controlled the subjects' choices. The results reported here are based on part of a doctoral dissertation submitted by the…

When comparing k normal populations an investigator might want to know the probability that the population with the largest population mean will have the largest sample mean. This paper describes and illustrates methods of approximating this probability when the variances are unknown and possibly unequal. (Author/BW)

A least squares statistical procedure for fitting utility functions is extended to truncated normal and extended beta functions. Implications for educational decision-making are discussed. (JKS)

Examination of the literature on statistics indicates that the rejection of the hypothesis of chance dates from the turn of the century. Early statements about statistical significance were given in terms of the "probable error." These earlier conventions were adopted and restated by Fisher in his "Statistical Methods for Research…

To facilitate statistical decisions about sets of results encompassing more than a single isolated test, a joint probability multiple comparisons significance test for path analysis, multiple regression, and a correlation matrix is developed. (Author/AEF)

The effect on subject performance due to different levels of feedforward and feedback information were investigated within a multiple cue probability learning setting. (Author/GK)

This paper provides a mathematical algorithm for Fisher's exact probability test which is adaptable to contingency tables greater than two by two, and which provides the user with an index of predictive association designed for crosstabulations of nominal level variables. (Author/JKS)

Employee training must accompany technology adoption. Develops a model of the firm incorporating employee training and the uncertain reliability of the effect on labor productivity. An augmenter captures training effect; a two-state probability function captures uncertainty. Estimates for training cost ratio range from 4-10 percent, so…