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錯誤可能性與預期衝突對於錯誤偵測系統之影響-以回饋負波為例 / Error likelihood and conflict in error monitoring system: a study of feedback negativity張瀠方, Chang, Yin Fang Unknown Date (has links)
現今解釋錯誤偵測系統及前扣帶皮質(ACC)的關係之理論主要為增強學習理論。增強學習理論認為個體會在行為後對於行為結果產生預期,並將該預期與實際結果進行比較,若實際結果較預期結果差則會活化ACC進而觀察到較大的FN(Feedback Negativity)振幅。近年來有學者提出奠基於增強學習理論的錯誤可能性理論,錯誤可能性理論則認為當個體在學習到行為與結果之間的關聯後,當接收到可能犯錯的訊息時便會活化ACC而引起較大的FN。本研究主要的目的為探討增強學習理論及錯誤可能性理論的適用性,其次為探討風險之因素是否能反映於FN上。由於兩理論對於風險情境中是否會觀察到FN有不同的預測,錯誤可能性理論預測會在高風險的情況下觀察到較大的FN;而增強學習理論則預測由於風險畫面並非回饋畫面,故風險不會影響FN。實驗一藉由探討風險與FN間之關係企圖提供兩理論初步之區分並提供風險研究的實驗證據,實驗一結果顯示FN確實會反映風險之因素。也點出增強學習理論用以解釋錯誤偵測系統之不完備之處。而實驗二則利用操弄回饋結果好壞及高低錯誤可能性以檢驗錯誤可能性對於錯誤偵測系統之必要性,實驗二結果顯示錯誤可能性為事件評估之因素之一。除此之外,實驗二亦提供FN反映懊悔之支持性證據。
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Hypothesis testing in econometric modelsVilela, Lucas Pimentel 11 December 2015 (has links)
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Previous issue date: 2015-12-11 / This thesis contains three chapters. The first chapter considers tests of the parameter of an endogenous variable in an instrumental variables regression model. The focus is on one-sided conditional t-tests. Theoretical and numerical work shows that the conditional 2SLS and Fuller t-tests perform well even when instruments are weakly correlated with the endogenous variable. When the population F-statistic is as small as two, the power is reasonably close to the power envelopes for similar and non-similar tests which are invariant to rotation transformations of the instruments. This finding is surprising considering the poor performance of two-sided conditional t-tests found in Andrews, Moreira, and Stock (2007). These tests have bad power because the conditional null distributions of t-statistics are asymmetric when instruments are weak. Taking this asymmetry into account, we propose two-sided tests based on t-statistics. These novel tests are approximately unbiased and can perform as well as the conditional likelihood ratio (CLR) test. The second and third chapters are interested in maxmin and minimax regret tests for broader hypothesis testing problems. In the second chapter, we present maxmin and minimax regret tests satisfying more general restrictions than the alpha-level and the power control over all alternative hypothesis constraints. More general restrictions enable us to eliminate trivial known tests and obtain tests with desirable properties, such as unbiasedness, local unbiasedness and similarity. In sequence, we prove that both tests always exist and under suficient assumptions, they are Bayes tests with priors that are solutions of an optimization problem, the dual problem. In the last part of the second chapter, we consider testing problems that are invariant to some group of transformations. Under the invariance of the hypothesis testing, the Hunt-Stein Theorem proves that the search for maxmin and minimax regret tests can be restricted to invariant tests. We prove that the Hunt-Stein Theorem still holds under the general constraints proposed. In the last chapter we develop a numerical method to implement maxmin and minimax regret tests proposed in the second chapter. The parametric space is discretized in order to obtain testing problems with a finite number of restrictions. We prove that, as the discretization turns finer, the maxmin and the minimax regret tests satisfying the finite number of restrictions have the same alternative power of the maxmin and minimax regret tests satisfying the general constraints. Hence, we can numerically implement tests for a finite number of restrictions as an approximation for the tests satisfying the general constraints. The results in the second and third chapters extend and complement the maxmin and minimax regret literature interested in characterizing and implementing both tests. / Esta tese contém três capítulos. O primeiro capítulo considera testes de hipóteses para o coeficiente de regressão da variável endógena em um modelo de variáveis instrumentais. O foco é em testes-t condicionais para hipóteses unilaterais. Trabalhos teóricos e numéricos mostram que os testes-t condicionais centrados nos estimadores de 2SLS e Fuller performam bem mesmo quando os instrumentos são fracamente correlacionados com a variável endógena. Quando a estatística F populacional é menor que dois, o poder é razoavelmente próximo do poder envoltório para testes que são invariantes a transformações que rotacionam os instrumentos (similares ou não similares). Este resultado é surpreendente considerando a baixa performance dos testes-t condicionais para hipóteses bilaterais apresentado em Andrews, Moreira, and Stock (2007). Estes testes possuem baixo poder porque as distribuições das estatísticas-t na hipótese nula são assimétricas quando os instrumentos são fracos. Explorando tal assimetria, nós propomos testes para hipóteses bilaterais baseados em estatísticas-t. Estes testes são aproximadamente não viesados e podem performar tão bem quanto o teste de razão de máxima verossimilhança condicional. No segundo e no terceiro capítulos, nosso interesse é em testes do tipo maxmin e minimax regret para testes de hipóteses mais gerais. No segundo capítulo, nós apresentamos testes maxmin e minimax regret que satisfazem restrições mais gerais que as restrições de tamanho e de controle sobre todo o poder na hipótese alternativa. Restrições mais gerais nos possibilitam eliminar testes triviais e obter testes com propriedades desejáveis, como por exemplo não viés, não viés local e similaridade. Na sequência, nós provamos que ambos os testes existem e, sob condições suficientes, eles são testes Bayesianos com priors que são solução de um problema de otimização, o problema dual. Na última parte do segundo capítulo, nós consideramos testes de hipóteses que são invariantes à algum grupo de transformações. Sob invariância, o Teorema de Hunt-Stein implica que a busca por testes maxmin e minimax regret pode ser restrita a testes invariantes. Nós provamos que o Teorema de Hunt-Stein continua válido sob as restrições gerais propostas. No último capítulo, nós desenvolvemos um procedimento numérico para implementar os testes maxmin e minimax regret propostos no segundo capítulo. O espaço paramétrico é discretizado com o objetivo de obter testes de hipóteses com um número finito de pontos. Nós provamos que, ao considerarmos partições mais finas, os testes maxmin e minimax regret que satisfazem um número finito de pontos possuem o mesmo poder na hipótese alternativa que os testes maxmin e minimax regret que satisfazem as restrições gerais. Portanto, nós podemos implementar numericamente os testes que satisfazem um número finito de pontos como aproximação aos testes que satisfazem as restrições gerais.
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Étude comparative sur les méthodes de prises de décisions = A comparative study on decision-making methodologyWu, Zhen January 2020 (has links) (PDF)
No description available.
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Med historien som motståndare : SKP/VPK/V och det kommunistiska arvet 1956-2006 / History as Adversary : The Swedish Communist and Post-Communist Party and the Legacy of Communism 1956-2006Bergner, Petter January 2013 (has links)
This dissertation concerns Sveriges Kommunistiska Parti (SKP) [the Swedish Communist Party] – in 1967 renamed Vänsterpartiet kommunisterna (VPK) [the Left Party – the Communists] and in 1990 renamed Vänsterpartiet (V) [the Left Party] – and the Party's process of coming to terms with history and its communist legacy. The aim of the study is to describe and analyse the SKP/VPK/V's process of coming to terms with history for the period 1956-2006, and to set out and problematise the driving forces and constraining mechanisms of this process. The theoretical framework of the study consists of Gunnar Sjöblom’s theory about party strategies of political parties in multi-party systems and Michael Freeden’s conceptual approach to ideology analysis. During the period of study the SKP/VPK/V has, like no other political party in Sweden, been ascribed historical guilt regarding its own party history but also regarding the effects of world communism. The Party has thus found itself in a situation where it has had history as an adversary. The process of coming to terms with history has mainly revolved around three issues: independence (1956-1977), international ties (1977-1989) and a broadening beyond the communist tradition (1986-2006). The internal debate within the Party has linked these issues to calls for change aimed at ridding the party of what is considered undesirable elements of the Communist legacy. By analysing the arguments pursued in favour of these calls, it is possible to pick out a number of the driving forces behind the Party's process of coming to terms with history, namely an ambition to obtain vote maximisation, programme realisation and maximisation of parliamentary influence. The urge to distance the Party from certain aspects of its communist past has thus been related to fundamental goals that political parties in multi-party systems seek to obtain. The results of the dissertation show that it is possible to pick out five main constraining mechanisms in the Party's process of coming to terms with history. 1) The safeguarding of Party cohesion. 2) The safeguarding of the distinctive character of the Party. 3) The need to resist external pressure. 4) The desire to avoid unfair apportioning of blame. 5) The safeguarding of the right to define the substance of one's own ideology. The existence of these constraining mechanisms help to explain why the process of coming to terms with history lingered on for several decades, and also why it seems to have been a process of such complexity for the Swedish Communist and Post-Communist Party.
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