title: Alternating model trees

authors: Frank, Eibe

subjects: computer science

abstract: Model tree induction is a popular method for tackling regression problems requiring interpretable models. Model trees are decision trees with multiple linear regression models at the leaf nodes. In this paper, we propose a method for growing alternating model trees, a form of option tree for regression problems. The motivation is that alternating decision trees achieve high accuracy in classification problems because they represent an ensemble classifier as a single tree structure. As in alternating decision trees for classifi-cation, our alternating model trees for regression contain splitter and prediction nodes, but we use simple linear regression functions as opposed to constant predictors at the prediction nodes. Moreover, additive regression using forward stagewise modeling is applied to grow the tree rather than a boosting algorithm. The size of the tree is determined using cross-validation. Our empirical results show that alternating model trees achieve significantly lower squared error than standard model trees on several regression datasets.

text: Alternating model trees Model tree induction is a popular method for tackling regression problems requiring interpretable models. Model trees are decision trees with multiple linear regression models at the leaf nodes. In this paper, we propose a method for growing alternating model trees, a form of option tree for regression problems. The motivation is that alternating decision trees achieve high accuracy in classification problems because they represent an ensemble classifier as a single tree structure. As in alternating decision trees for classifi-cation, our alternating model trees for regression contain splitter and prediction nodes, but we use simple linear regression functions as opposed to constant predictors at the prediction nodes. Moreover, additive regression using forward stagewise modeling is applied to grow the tree rather than a boosting algorithm. The size of the tree is determined using cross-validation. Our empirical results show that alternating model trees achieve significantly lower squared error than standard model trees on several regression datasets.

year: 2015

title: The sprout: Exploring a culture of co-operation and co-construction in year 9 science

authors: Taylor, Simon

abstract: This article explores opportunities in year 9 science classes, where teaching strategies of student cooperation and co-construction are considered. The term co-operation describes students sharing a task together, and having the opportunity to work and internet with their teacher and peers Co-operation depends on students knowing when it is appropriate to listen and when to speak, knowing how to show respect for cultural difference, and how to be open-minded to different ideas.

text: The sprout: Exploring a culture of co-operation and co-construction in year 9 science This article explores opportunities in year 9 science classes, where teaching strategies of student cooperation and co-construction are considered. The term co-operation describes students sharing a task together, and having the opportunity to work and internet with their teacher and peers Co-operation depends on students knowing when it is appropriate to listen and when to speak, knowing how to show respect for cultural difference, and how to be open-minded to different ideas.

year: 2016

title: Barry Barclay: the Reflection of Maori and Pakeha Identities

authors: Hilal, Emad Jabbar

subjects: emad

abstract: This Media and Screen Studies thesis tries to investigate the identifications of Barry Barclay (1944-2008) - a New Zealand filmmaker, thinker and poet, of Māori and Pākeha ethnic background - who identified as Māori in the second part of his career, in the mid 1970s. The thesis relies on Barclay's writing and other historical and theoretical material in the reading of his own films. The thesis arrives at an argument that even when Barclay chose to identify more with the Māori side of his identity, the Pākeha side took part also in the shaping of his film practices. Studying Barry Barclay along this line of argument has several benefits for Screen Studies. It, on the one hand, covers what is left unstudied by the scholarship concerning his representation of the Māori world such as the way he commented on Māori cultural and social concerns and acheivements in his films. The thesis studies Barclay's films from the time he started his identification with his Māori  side in Tangaata Whenua (1974), Te Urewera (1987), Ngati (1987),Te Rua (1991) and takes The Kaipara Affair (2005) as a case study and a carrier of change in film practices and development in outlook.The other important contribution is the way he represented Pākeha, and how he developed his representation of them in time. This representation which is unstudied at all, is important to Screen Studies becuase it contributes to Barclay's theory of Fourth Cinema. This thesis shows how representing Pakeha, especially in Barclay's last film problemematizes his theory of Fourth Cinema, but ultimately, deals with applies it creatively. The representation of Pākeha gives insight into Barclay's interest in the Māori world, which is not a dogma or a merely ethnic affiliation as much as an attraction to a world-view that can solve major universal issues such as environmental problems. Above all, the way how Barclay worked out this representation in his films sheds light on one of the important examples of how film can take part in healing social damages such as the history of colonizing and marginalization of Māori people.

text: Barry Barclay: the Reflection of Maori and Pakeha Identities This Media and Screen Studies thesis tries to investigate the identifications of Barry Barclay (1944-2008) - a New Zealand filmmaker, thinker and poet, of Māori and Pākeha ethnic background - who identified as Māori in the second part of his career, in the mid 1970s. The thesis relies on Barclay's writing and other historical and theoretical material in the reading of his own films. The thesis arrives at an argument that even when Barclay chose to identify more with the Māori side of his identity, the Pākeha side took part also in the shaping of his film practices. Studying Barry Barclay along this line of argument has several benefits for Screen Studies. It, on the one hand, covers what is left unstudied by the scholarship concerning his representation of the Māori world such as the way he commented on Māori cultural and social concerns and acheivements in his films. The thesis studies Barclay's films from the time he started his identification with his Māori  side in Tangaata Whenua (1974), Te Urewera (1987), Ngati (1987),Te Rua (1991) and takes The Kaipara Affair (2005) as a case study and a carrier of change in film practices and development in outlook.The other important contribution is the way he represented Pākeha, and how he developed his representation of them in time. This representation which is unstudied at all, is important to Screen Studies becuase it contributes to Barclay's theory of Fourth Cinema. This thesis shows how representing Pakeha, especially in Barclay's last film problemematizes his theory of Fourth Cinema, but ultimately, deals with applies it creatively. The representation of Pākeha gives insight into Barclay's interest in the Māori world, which is not a dogma or a merely ethnic affiliation as much as an attraction to a world-view that can solve major universal issues such as environmental problems. Above all, the way how Barclay worked out this representation in his films sheds light on one of the important examples of how film can take part in healing social damages such as the history of colonizing and marginalization of Māori people.

year: 2017