title: Efficient Model Selection in Linear and Non-Linear Quantile Regression by Cross-Validation

authors: Jung, Yoonsuh

subjects: cross-validation

abstract: Check loss function is used to define quantile regression. In the prospect of cross validation, it is also employed as a validation function when underlying truth is unknown. However, our empirical study indicates that the validation with check loss often leads to choosing an over estimated fits. In this work, we suggest a modified or L2-adjusted check loss which rounds the sharp corner in the middle of check loss. It has a large effect of guarding against over fitted model in some extent. Through various simulation settings of linear and non-linear regressions, the improvement of check loss by L2 adjustment is empirically examined. This adjustment is devised to shrink to zero as sample size grows.

text: Efficient Model Selection in Linear and Non-Linear Quantile Regression by Cross-Validation Check loss function is used to define quantile regression. In the prospect of cross validation, it is also employed as a validation function when underlying truth is unknown. However, our empirical study indicates that the validation with check loss often leads to choosing an over estimated fits. In this work, we suggest a modified or L2-adjusted check loss which rounds the sharp corner in the middle of check loss. It has a large effect of guarding against over fitted model in some extent. Through various simulation settings of linear and non-linear regressions, the improvement of check loss by L2 adjustment is empirically examined. This adjustment is devised to shrink to zero as sample size grows.

year: 2016-04-19

title: Book review: The Sephardic Frontier: The Reconquista and the Jewish Community in Medieval Iberia – By Jonathan Ray

authors: Simms, Norman

subjects: book review

abstract: This article reviews the book: “The Sephardic frontier: The reconquista and the Jewish community in medieval Iberia”, by Jonathan Ray.

text: Book review: The Sephardic Frontier: The Reconquista and the Jewish Community in Medieval Iberia – By Jonathan Ray This article reviews the book: “The Sephardic frontier: The reconquista and the Jewish community in medieval Iberia”, by Jonathan Ray.

year: 2011

title: Tū Te Turuturu Nō Hineteiwaiwa - Maintaining Cultural Integrity in the Teaching of Māori Weaving

authors: Turi-Tiakitai, John Reid

subjects: Māori

abstract: “He whatu kōrero mō te whatu
He whiriwhiri kōrero mō te whiri
He rangaranga kōrero mō te raranga”

Despite the development and teaching of an increasing number of Māori focused tertiary programmes, many kaumatua remain concerned that tikanga is being lost. The research reviews the developments that have impacted on the teaching of Māori weaving (raranga, whiri, and whatu) and appraises the current status from the perspective of the oral narratives of Edna Pahewa, Christina (Tina) Hurihia Wirihana and Matekino Lawless. Whilst they would not describe them as such, all three are expert weavers who teach this taonga.
These weavers concur that despite the increased numbers learning these arts and acquiring high capability in the technical skills, many often lack the wairua, tikanga and values and remain apprehensive for the state of the art. Therefore, they believe that mātauranga Māori, spiritual knowledge and Māori tikanga cultural practices must remain central, at the very core of the art form itself and not exist as an academic study or peripheral addendum.
As a result of this study, a model framework, ‘Te Kāwhatuwhatu’ is proposed that advocates for the incorporating of Māori tikanga cultural practices into classes and teaching pedagogy and thereby foster the wellbeing of this cultural legacy and the mana and integrity of Hineteiwaiwa, kia ea ai te kupu

“ka tū tonu te turuturu nō Hineteiwaiwa!”¹

text: Tū Te Turuturu Nō Hineteiwaiwa - Maintaining Cultural Integrity in the Teaching of Māori Weaving “He whatu kōrero mō te whatu
He whiriwhiri kōrero mō te whiri
He rangaranga kōrero mō te raranga”

Despite the development and teaching of an increasing number of Māori focused tertiary programmes, many kaumatua remain concerned that tikanga is being lost. The research reviews the developments that have impacted on the teaching of Māori weaving (raranga, whiri, and whatu) and appraises the current status from the perspective of the oral narratives of Edna Pahewa, Christina (Tina) Hurihia Wirihana and Matekino Lawless. Whilst they would not describe them as such, all three are expert weavers who teach this taonga.
These weavers concur that despite the increased numbers learning these arts and acquiring high capability in the technical skills, many often lack the wairua, tikanga and values and remain apprehensive for the state of the art. Therefore, they believe that mātauranga Māori, spiritual knowledge and Māori tikanga cultural practices must remain central, at the very core of the art form itself and not exist as an academic study or peripheral addendum.
As a result of this study, a model framework, ‘Te Kāwhatuwhatu’ is proposed that advocates for the incorporating of Māori tikanga cultural practices into classes and teaching pedagogy and thereby foster the wellbeing of this cultural legacy and the mana and integrity of Hineteiwaiwa, kia ea ai te kupu

“ka tū tonu te turuturu nō Hineteiwaiwa!”¹

year: 2015