title: The application of machine learning techniques to time-series data

authors: Mitchell, R. Scott

subjects: computer science

abstract: "Knowledge discovery" is one of the most recent and fastest growing fields of research in computer science. It combines techniques from machine learning and database technology to find and extract meaningful knowledge from large, real world databases. Much real world data is temporal in nature, for example stock prices, dairy cow milk production figures or meteorological data. Most current knowledge discovery systems utilise similarity-based machine learning methods "learning from examples" which are not in general well suited to this type of data. Time-series analysis techniques are used extensively in signal processing and sequence identification applications such as speech recognition, but have not often been considered for knowledge discovery tasks. This report documents new methods for discovering knowledge in real world time-series data. Two complementary approaches were investigated: 1) manipulation of the original dataset into a form that is usable by conventional similarity-based learners; and 2) using sequence identification techniques to learn the concepts embedded in the database. Experimental results obtained from applying both techniques to a large agricultural database are presented and analysed.

text: The application of machine learning techniques to time-series data "Knowledge discovery" is one of the most recent and fastest growing fields of research in computer science. It combines techniques from machine learning and database technology to find and extract meaningful knowledge from large, real world databases. Much real world data is temporal in nature, for example stock prices, dairy cow milk production figures or meteorological data. Most current knowledge discovery systems utilise similarity-based machine learning methods "learning from examples" which are not in general well suited to this type of data. Time-series analysis techniques are used extensively in signal processing and sequence identification applications such as speech recognition, but have not often been considered for knowledge discovery tasks. This report documents new methods for discovering knowledge in real world time-series data. Two complementary approaches were investigated: 1) manipulation of the original dataset into a form that is usable by conventional similarity-based learners; and 2) using sequence identification techniques to learn the concepts embedded in the database. Experimental results obtained from applying both techniques to a large agricultural database are presented and analysed.

year: 1995-05

title: Effects of a signaled delay to reinforcement in the previous and upcoming ratios on between-ratio pausing in fixed-ratio schedules

authors: Harris, Aimee Rebecca

subjects: fixed-ratio schedules

abstract: Domestic hens responded under multiple fixed-ratio fixed-ratio schedules with equal fixed ratios. One component provided immediate reinforcement and the other provided reinforcement after a delay, signaled by the offset of the key light. The components were presented quasirandomly so that all four possible transitions occurred in each session. The delay was varied over 0, 4, 8, 16, and 32 s with fixed-ratio 5 schedules, and over 0, 8 and 32 s with fixed-ratio 1, 15 and 40 schedules. Main effects of fixed-ratio value and delay duration were detected on between-ratio pauses. Pauses were longer when the multiple-schedule stimulus correlated with a delayed-reinforcer component was presented, with the longest pauses occurring at the transition from a component with an immediate reinforcer to one with a delayed reinforcer. Pause durations were shortest during immediate components. Overall, both the presence or absence of a delay in the upcoming component, and the presence or absence of a delay in the preceding component affected pause length, but the upcoming delay had the larger effect. Thus changes in delay had similar effects to past reports of the effects of changes in response force, response requirement, and reinforcer magnitude in multiple fixed-ratio fixed-ratio schedules.

text: Effects of a signaled delay to reinforcement in the previous and upcoming ratios on between-ratio pausing in fixed-ratio schedules Domestic hens responded under multiple fixed-ratio fixed-ratio schedules with equal fixed ratios. One component provided immediate reinforcement and the other provided reinforcement after a delay, signaled by the offset of the key light. The components were presented quasirandomly so that all four possible transitions occurred in each session. The delay was varied over 0, 4, 8, 16, and 32 s with fixed-ratio 5 schedules, and over 0, 8 and 32 s with fixed-ratio 1, 15 and 40 schedules. Main effects of fixed-ratio value and delay duration were detected on between-ratio pauses. Pauses were longer when the multiple-schedule stimulus correlated with a delayed-reinforcer component was presented, with the longest pauses occurring at the transition from a component with an immediate reinforcer to one with a delayed reinforcer. Pause durations were shortest during immediate components. Overall, both the presence or absence of a delay in the upcoming component, and the presence or absence of a delay in the preceding component affected pause length, but the upcoming delay had the larger effect. Thus changes in delay had similar effects to past reports of the effects of changes in response force, response requirement, and reinforcer magnitude in multiple fixed-ratio fixed-ratio schedules.

year: 2012

title: The contribution of family literacy programmes to the wellbeing of individuals, families and communities

authors: Furness, Jane Amanda

subjects: Adult Literacy Strategy

abstract: Approaches to literacy education named as ‘family literacy programmes’ first emerged in Aotearoa New Zealand in the early 2000s amidst considerable enthusiasm. Such approaches involve adults, children, or both in literacy learning in the contexts of home and family life. They are part of a wider field, established internationally, of academic and practical endeavour encompassing studies of the literacy practices of family members, studies of parents’ support of children’s literacy development, and studies of programmes aimed at enhancing family members’ literacy abilities, and the evaluations of such programmes. It is a contentious field, with divergent views of what constitutes both literacy and family, leading to differing expectations of what programmes are for and what they might achieve. From a moral perspective, hopes for such approaches, which hold much intuitive and culturally-located appeal, must be set against the concerning disparities in wellbeing between different groups, evident and growing in New Zealand as elsewhere. 

The study set out to explore the effects of a range of family-focused approaches in New Zealand, and their characteristics that seemed important in achieving relevant and meaningful outcomes for participants and their families. An important aim of the study was to encourage the essential conversation concerning the ideological and research-informed basis on which policies and practices should be developed to best suit our contexts, and that have people’s overall wellbeing, as well as their literacy development, in mind. The study traced the experiences of nineteen mainly Māori, Pacific and Pākehā adult participants in four varying family-focused literacy programmes located in different kinds of communities, drawing on Kaupapa Māori methodologies in its approach. Conversational interviews with the adult participants, programme staff and others who knew the participants well, repeated over 18 months, as well as participant observations of programme sessions and programme documentation, formed an extensive data set for latent theoretical thematic analysis. I identified literacy and other changes in the participants’ lives; synergistic links between factors influencing the programme effects, ‘flow on’ of effects to wider aspects of the participants’ lives and to their families and communities, and links to the personal, relational and collective wellbeing of individuals, families and communities.

The findings demonstrate that there are complex influences on programmes such that effects are highly individualised, but that there is nevertheless a tangible, discernable process in play as people journey from participation to wellbeing, in which literacy enhancement, familiarity with new literacies, and new uses of literacies, are involved. The study suggests a disjuncture between current literacy education policy and the hopes, aspirations and real lives of many people for whom the programmes are intended and who wish to contribute to their families and communities despite their complex and often fraught lives. It also demonstrates that a deep level of care and holistic concern is possible in a programme which also achieves literacy skill development. Recognition of people’s whole selves including their problems and their existing abilities in programme content and approach demonstrated the ‘respectful relevance’ that appears crucial to the involvement and the positive (useful and meaningful) outcomes that were observed. It demonstrated that a broad and inclusive evaluative lens offers the best hope for full appreciation of the contribution of programmes such as these, when the overall wellbeing of families, communities and society as a whole is placed at the centre of literacy work. 

The study offers new and urgently-needed ecological systems-based models within a wellbeing orientation to family literacy theory. These have implications for the future development of programmes in Aotearoa New Zealand and provide frameworks against which programmes internationally may consider their work afresh. The study calls for greater community relevance in family literacy based on local values and aspirations.

text: The contribution of family literacy programmes to the wellbeing of individuals, families and communities Approaches to literacy education named as ‘family literacy programmes’ first emerged in Aotearoa New Zealand in the early 2000s amidst considerable enthusiasm. Such approaches involve adults, children, or both in literacy learning in the contexts of home and family life. They are part of a wider field, established internationally, of academic and practical endeavour encompassing studies of the literacy practices of family members, studies of parents’ support of children’s literacy development, and studies of programmes aimed at enhancing family members’ literacy abilities, and the evaluations of such programmes. It is a contentious field, with divergent views of what constitutes both literacy and family, leading to differing expectations of what programmes are for and what they might achieve. From a moral perspective, hopes for such approaches, which hold much intuitive and culturally-located appeal, must be set against the concerning disparities in wellbeing between different groups, evident and growing in New Zealand as elsewhere. 

The study set out to explore the effects of a range of family-focused approaches in New Zealand, and their characteristics that seemed important in achieving relevant and meaningful outcomes for participants and their families. An important aim of the study was to encourage the essential conversation concerning the ideological and research-informed basis on which policies and practices should be developed to best suit our contexts, and that have people’s overall wellbeing, as well as their literacy development, in mind. The study traced the experiences of nineteen mainly Māori, Pacific and Pākehā adult participants in four varying family-focused literacy programmes located in different kinds of communities, drawing on Kaupapa Māori methodologies in its approach. Conversational interviews with the adult participants, programme staff and others who knew the participants well, repeated over 18 months, as well as participant observations of programme sessions and programme documentation, formed an extensive data set for latent theoretical thematic analysis. I identified literacy and other changes in the participants’ lives; synergistic links between factors influencing the programme effects, ‘flow on’ of effects to wider aspects of the participants’ lives and to their families and communities, and links to the personal, relational and collective wellbeing of individuals, families and communities.

The findings demonstrate that there are complex influences on programmes such that effects are highly individualised, but that there is nevertheless a tangible, discernable process in play as people journey from participation to wellbeing, in which literacy enhancement, familiarity with new literacies, and new uses of literacies, are involved. The study suggests a disjuncture between current literacy education policy and the hopes, aspirations and real lives of many people for whom the programmes are intended and who wish to contribute to their families and communities despite their complex and often fraught lives. It also demonstrates that a deep level of care and holistic concern is possible in a programme which also achieves literacy skill development. Recognition of people’s whole selves including their problems and their existing abilities in programme content and approach demonstrated the ‘respectful relevance’ that appears crucial to the involvement and the positive (useful and meaningful) outcomes that were observed. It demonstrated that a broad and inclusive evaluative lens offers the best hope for full appreciation of the contribution of programmes such as these, when the overall wellbeing of families, communities and society as a whole is placed at the centre of literacy work. 

The study offers new and urgently-needed ecological systems-based models within a wellbeing orientation to family literacy theory. These have implications for the future development of programmes in Aotearoa New Zealand and provide frameworks against which programmes internationally may consider their work afresh. The study calls for greater community relevance in family literacy based on local values and aspirations.

year: 2012