title: A K-fold averaging cross-validation procedure

authors: Jung, Yoonsuh

abstract: Cross-validation (CV) type of methods have been widely used to facilitate model estimation and variable selection. In this work, we suggest a new K-fold CV procedure to select a candidate ‘optimal’ model from each hold-out fold and average the K candidate ‘optimal’ models to obtain the ultimate model. Due to the averaging effect, the variance of the proposed estimates can be significantly reduced. This new procedure results in more stable and efficient parameter estimation than the classical K-fold CV procedure. In addition, we show the asymptotic equivalence between the proposed and classical CV procedures in the linear regression setting. We also demonstrate the broad applicability of the proposed procedure via two examples of parameter sparsity regularisation and quantile smoothing splines modelling. We illustrate the promise of the proposed method through simulations and a real data example.

text: A K-fold averaging cross-validation procedure Cross-validation (CV) type of methods have been widely used to facilitate model estimation and variable selection. In this work, we suggest a new K-fold CV procedure to select a candidate ‘optimal’ model from each hold-out fold and average the K candidate ‘optimal’ models to obtain the ultimate model. Due to the averaging effect, the variance of the proposed estimates can be significantly reduced. This new procedure results in more stable and efficient parameter estimation than the classical K-fold CV procedure. In addition, we show the asymptotic equivalence between the proposed and classical CV procedures in the linear regression setting. We also demonstrate the broad applicability of the proposed procedure via two examples of parameter sparsity regularisation and quantile smoothing splines modelling. We illustrate the promise of the proposed method through simulations and a real data example.

year: 2015-02-26

title: Animal behaviour meets technology on the New Zealand biotechnology learning hub (www.biotechlearn.org.nz)

authors: Buntting, Catherine Michelle

subjects: milking machine

abstract: The article reports on the research that examine the capacity of a fully automated milking system at the Dexcel's Greenfield Project, a research farm set up in Hamilton, New Zealand. Robotic milking system, in contrast to batch milking, is used to milk 180 cows once every 18 hours. A robotic milker can milk one cow at a time and no cow activity happens in the morning. A system was developed where new cows will be trained and a milking machine system that operates within 24 hours.

text: Animal behaviour meets technology on the New Zealand biotechnology learning hub (www.biotechlearn.org.nz) The article reports on the research that examine the capacity of a fully automated milking system at the Dexcel's Greenfield Project, a research farm set up in Hamilton, New Zealand. Robotic milking system, in contrast to batch milking, is used to milk 180 cows once every 18 hours. A robotic milker can milk one cow at a time and no cow activity happens in the morning. A system was developed where new cows will be trained and a milking machine system that operates within 24 hours.

year: 2006

title: Reo Rua Pukapuka Pikitia: Whānau drawing on their community cultural wealth to create strategies for developing Te Reo Rangatira

authors: Brouwer, Jacqui

abstract: The use of Te Reo Māori in Early Childhood Education in Aotearoa New Zealand is mandated in the ECE curriculum. Research shows that picturebooks are powerful tools in language learning, but there is a lack of research concerning the use of bilingual picturebooks by whānau to support Māori language learning in a New Zealand kindergarten. This research presents findings from a 4-week programme in which five whānau members were introduced to several types of dual language picturebooks (Reo Rua Pukapuka Pikitia, RRPP) in a Puna Pukapuka Pikitia (PPP). Whānau explored RRPP and suggested how they could bring Reo Rangatira from RRPP into their homes to support language learning. Their suggestions aligned with Ellis’s principles of effective language teaching (Ellis, 2010) including the development of formulaic phrases, following the ways in which tamariki naturally learn language, encouraging opportunities for tamariki to speak and listen, as well as having interactions linked to RRPP.

text: Reo Rua Pukapuka Pikitia: Whānau drawing on their community cultural wealth to create strategies for developing Te Reo Rangatira The use of Te Reo Māori in Early Childhood Education in Aotearoa New Zealand is mandated in the ECE curriculum. Research shows that picturebooks are powerful tools in language learning, but there is a lack of research concerning the use of bilingual picturebooks by whānau to support Māori language learning in a New Zealand kindergarten. This research presents findings from a 4-week programme in which five whānau members were introduced to several types of dual language picturebooks (Reo Rua Pukapuka Pikitia, RRPP) in a Puna Pukapuka Pikitia (PPP). Whānau explored RRPP and suggested how they could bring Reo Rangatira from RRPP into their homes to support language learning. Their suggestions aligned with Ellis’s principles of effective language teaching (Ellis, 2010) including the development of formulaic phrases, following the ways in which tamariki naturally learn language, encouraging opportunities for tamariki to speak and listen, as well as having interactions linked to RRPP.

year: 2023