Test theory without an answer key

A general model is presented for homogeneous, dichotomous items when the answer key is not known a priori. The model is structurally related to the two-class latent structure model with the roles of respondents and items interchanged. For very small sets of respondents, iterative maximum likelihood estimates of the parameters can be obtained by existing methods. For other situations, new estimation methods are developed and assessed with Monte Carlo data. The answer key can be accurately reconstructed with relatively small sets of respondents. The model is useful when a researcher wants to study objectively the knowledge possessed by members of a culturally coherent group that the researcher is not a member of.This research was supported by NSF Grant No. SES-8320173 to the authors. We gratefully acknowledge comments and suggestions from John Boyd, Tarow Indow, and Kathy Maher as well as the editor and several anonymous referees.     

Interpreting action as an answer

The aim of this paper is to introduce a logically grounded approach to action semantics and action interpretation. The main idea is to present the context of action as a set of questions demanding an action to answer. I introduce (a) a basic procedure of action interpretation, which is a reformulation of Hilpinen's semantical procedure for imperatives; (b) a procedure of what-interpretation; (c) a procedure of why-interpretation. The conditions of mutual reducibility of interpretation procedures are explicated. The paper concludes by putting forth the problem of interpretive bounds of moral responsibility.     

Caught in the Language-Game

In this paper, I first introduce the main motivations for the internalism/externalism dichotomy in epistemology and explore different accounts of epistemic justification, mostly externalist, arising from Dretske’s relevant alternatives theory of knowledge, namely the reliabilism of Goldman and Nozick, the contextualism of Cohen and DeRose, which is governed by fallibilist standards, and Lewis’ version of contextualism, to which infallibilist standards apply. I then argue that Wittgenstein critically anticipates many of these strategies and tries to avoid such a dichotomy by assuming a form of infallibilism which is neither internal nor external. After introducing the idea of a Wittgensteinian hinge epistemology and how it responds to the problem of epistemic justification and to the particular challenge posed by radical scepticism, I defend the view that infallibility is logically unavoidable when we realize that we are always trapped in one language-game or another, even if we constantly switch between language-games.

     

Caught Between Two Worlds:

No abstract available for this article.     

生命是什么:一个基于新物理学原理的回答

生命本质问题是生物学、哲学、物理学等各领域科学工作者共同关心的问题。回顾人们对生命本质问题的认识历程,依据一个新的物理学原理(最大流原理),尝试给出生命的新定义。     

Daylight savings: what an answer to the perceptual variation problem cannot be

Philosophical Studies - Significant variations in the way objects appear across different viewing conditions pose a challenge to the view that they have some true, determinate color. This view...     

Homicide without an apparent motive

Fifty-two defendants who allegedly killed without apparent motive were compared to 154 homicide defendants with clear motives on demographic and psychiatric variables. Individuals who killed without motive were more likely to have: (1) no history of alcohol abuse: (2) a recent release from prison: (3) claims of amnesia for the crime; and (4) denial of the crime. They also tended to exhibit psychotic behavior following the crime and to be assessed as not guilty of the crime due to mental illness.     

One answer to the demand for accountability: Selection utility as an investment decision

An examination of selection utility models demonstrates that they bear a considerable resemblance to capital budgeting models well established in the finance literature. Five applications of capital budgeting to selection utility are suggested and discussed. Capital budgeting concepts are recommended as a rich source of further practical and theoretical development of selection Utility models.     

无穷探索与终极答案——从两个有神论兼无神论的小故事看科学与神学的区别

科学承认人类还有很多未知领域,神学才宣称所有问题皆已有答案。科学只给出目前可以验证的答案,对尚验证不了答案的问题继续进行探索;而神学则认为自己给出的是最终的答案,不需要继续探究。用了神学方法,任何动脑筋的事情都可以省了。     

Defining answer classes using resolution refutation

Resolution theorem proving provides a useful paradigm for the exploration of question answering. A partition of the clauses generated during resolution refutation based on their syntactic structure is presented. The three classes comprising this partition correspond to semantically intuitive types of answers. This work encompasses and expands upon previous work on question answering in a theorem proving paradigm, which began with the association of answers with proofs. A complete, formal definition of what is meant by answer in the context of resolution theorem proving is presented. In this context, clauses that are relevant are all identified as answers, where relevance is determined with respect to a question and knowledge base: any clause descended from the clause form of a negated question is deemed relevant. This definition of relevance is not in and of itself novel; rather, it is the way in which the set of relevant clauses is partitioned that provides the key to interpreting clauses as answers. The three answer classes identified are: specific, generic, and hypothetical. These classes are formally distinguished by the way in which literals in a clause share variables, with class membership based on a property termed the closure of variable sharing of a literal. The results presented provide a foundation for further work by establishing a context-independent logical pragmatics of question answering.     

Beyond the answer: post-error processes

When you suspect that you just gave an erroneous answer to a question you stop and rethink. Suspected errors lead to a shift in the control and content of cognitive processes. In the present experiment we investigated the influence of errors upon heart rates and response latencies. Sixty-four subjects participated in an experiment in which each subject solved a sequence of 60 verbal analogies. The results demonstrated increased latencies after errors and decelerated heart rates during the post-error period. The results were explained by a psychophysiological model in which the septo-hippocampal system functions as a control system which coordinates the priority and selection of cognitive processes. Error detection suppresses strategies which otherwise prevent looping and iterative reanalyses of old material. The inhibition is also responsible for the cardiac slowing during the post-error period.