This paper describes a generative theory of bugs. It claims that all bugs of a procedural skill can be derived by a highly constrained form of problem solving acting on incomplete procedures. These procedures are characterized by formal deletion operations that model incomplete learning and forgetting. The problem solver and the deletion operator have been constrained to make it impossible to derive “star‐bugs”—algorithms that are so absurd that expert diagnosticians agree that the alogorithm will never be observed as a bug. (...) Hence, the theory not only generates the observed bugs, it fails to generate star‐bugs.The theory has been tested on an extensive data base of bugs for multidigit subtraction that was collected with the aid of the diagnostic systems buggy and debuggy. In addition to predicting bug occurrence, by adoption of additional hypotheses, the theory also makes predictions about the frequency and stability of bugs, as well as the occurrence of certain latencies in processing time during testing. Arguments are given that the theory can be applied to domains other than subtraction and that it can be extended to provide a theory of procedural learning that accounts for bug acquisition. Lastly, particular care has been taken to make the theory principled so that it can not be tailored to fit any possible data. (shrink)

A new diagnostic modeling system for automatically synthesizing a deep‐structure model of a student's misconceptions or bugs in his basic mathematical skills provides a mechanism for explaining why a student is making a mistake as opposed to simply identifying the mistake. This report is divided into four sections: The first provides examples of the problems that must be handled by a diagnostic model. It then introduces procedural networks as a general framework for representing the knowledge underlying a skill. The challenge (...) in designing this representation is to find one that facilitates the discovery of misconceptions or bugs existing in a particular student's encoding of this knowledge. The second section discusses some of the pedagogical issues that have emerged from the use of diagnostic models within an instructional system. This discussion is framed in the context of a computer‐based tutoring/gaming system developed to teach students and student teachers how to diagnose bugs strategically as well as how to provide a better understanding of the underlying structure of arithmetic skills. The third section describes our uses of an executable network as a tool for automatically diagnosing student behavior, for automatically generating “diagnostic” tests, and for judging the diagnostic quality of a given exam. Included in this section is a discussion of the success of this system in diagnosing 1300 school students from a data base of 20.000 test items. The last section discusses future research directions. (shrink)

Excerpt from An Estimate of the Manners and Principles of the Times Quamvis Pontica Pinus, Silqilia nobilis, Jae'tcs 8c Genus 8: Nomcn inutile. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, (...) such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works. (shrink)

ONTHE CHARACTERISTICS OF THE Earl of Shaftesbury. I. On RIDICULE, considered as a Test of Truth. II. On the Motives to Virtue, and the Necessity of ...

The focus of this study is on media reporting of police involved shootings in Florida. Given that knowledge of killings committed by law enforcement are frequently restricted to what people get from news sources, it is important to investigate the way these messages are being communicated. An exploratory analysis of 199 articles and transcripts covering 86 cases relevant to deadly use of force by police officers as reported from 2013 to 2015 provided the primary data source. The analysis engaged a (...) critical examination of media content and goodness of fit models to identify commonalities used by the media when reporting police involved shootings. The goal is to determine the potential impact of race, age and gender of a victim with regard to the media’s portrayal of events that result in lethal use of force by police. It is expected that exposure of the discoveries in this study will influence future law enforcement reporting systems for a more transparent relationship between police, news and the community. The demographics characteristics race, sex and age that were assessed in this study were not significantly associated with the length of media coverage on police involved shootings. However, further analysis using different modeling approaches are required for a better understanding as to whether a relationship exists. (shrink)

John Brown took aim at England's higher ranks, calling out their lifestyle as "vain, luxurious, and selfish effeminacy" in a vigorous attack in his main work, An Estimate of the Manners and Principles of the Times (1757). This volume also includes four other works by Brown, as well as a tribute to Brown written by Thomas Hollis and Hollis' annotations in his personal copy of Estimate. The introduction, by David Womersley, places Brown's writings and career in the context of eighteenth-century (...) moralism and his annotations will explain now-unfamiliar words and references to contemporary events, circumstances, and personalities. (shrink)

Many of the earliest books, particularly those dating back to the 1900s and before, are now extremely scarce and increasingly expensive. We are republishing these classic works in affordable, high quality, modern editions, using the original text and artwork.

The Darvishes is an invaluable contribution to the study of the Belief and spiritual principles of the Darvish Orders and is one of the most accurate reference works on the subject. Drawn exclusively from the original Oriental works, and from Turkish, Arabic and Persian manuscripts the originality and authenticity of the work is beyond doubt. As well as discussing Darvish doctrines and history, the volume also examines the spiritual and metaphysical significance of Sufism as a living tradition.

This is a reproduction of a book published before 1923. This book may have occasional imperfections such as missing or blurred pages, poor pictures, errant marks, etc. that were either part of the original artifact, or were introduced by the scanning process. We believe this work is culturally important, and despite the imperfections, have elected to bring it back into print as part of our continuing commitment to the preservation of printed works worldwide. We appreciate your understanding of the imperfections (...) in the preservation process, and hope you enjoy this valuable book. ++++ The below data was compiled from various identification fields in the bibliographic record of this title. This data is provided as an additional tool in helping to ensure edition identification: ++++ The Ethics Of George Eliot's Works 3 John Crombie Brown W. Blackwood, 1880 Literary Criticism; European; English, Irish, Scottish, Welsh; Literary Criticism / European / English, Irish, Scottish, Welsh; Literary Criticism / Women Authors. (shrink)

This book originates from an international research program that is reassessing when and why modern careers emerged. With fifteen essays this volume brings together some of the most important results of this new field of research. Based upon the innovative use of micro-level historical sources, the contributions by economic and social historians reveal the emergence of identifiable career paths in a wide range of occupational settings in Europe and the Americas over the period 1800 to the end of World War (...) II. They highlight the economic and social forces that shaped the creation of both formal and informal career paths and led to their diffusion throughout the workforces of most developed economies by the early 1950s. (shrink)

For 50 years, Star Trek has been an inspiration to its fans around the world, helping them to dream of a better future. This inspiration has entered our culture and helped to shape much of the technology of the early 21st Century. The contributors to this volume are researchers and teachers in a wide variety of disciplines; from Astrophysics to Ethnology, from English and History to Medicine and Video Games, and from American Studies to the study of Collective Computing Systems. (...) What the authors have in common is that some version of Star Trek has inspired them, not only in their dreams of what may be, but in the ways in which they work - and teach others to work - here in the real world. Introduced with references to Star Trek films and television shows, and illustrated with original cartoons, each of the 15 chapters included in this volume provides insights into research and teaching in this range of academic fields. (shrink)