title: Mining Arbitrarily Large Datasets Using Heuristic k-Nearest Neighbour Search

authors: Wu, Xing

subjects: computer science

abstract: Nearest Neighbour Search (NNS) is one of the top ten data mining algorithms. It is simple and effective but has a time complexity that is the product of the number of instances and the number of dimensions. When the number of dimensions is greater than two there are no known solutions that can guarantee a sublinear retrieval time. This paper describes and evaluates two ways to make NNS efficient for datasets that are arbitrarily large in the number of instances and dimensions. The methods are best described as heuristic as they are neither exact nor approximate. Both stem from recent developments in the field of data stream classification. The first uses Hoeffding Trees, an extension of decision trees to streams and the second is a direct stream extension of NNS. The methods are evaluated in terms of their accuracy and the time taken to find the neighbours. Results show that the methods are competitive with NNS in terms of accuracy but significantly faster.

text: Mining Arbitrarily Large Datasets Using Heuristic k-Nearest Neighbour Search Nearest Neighbour Search (NNS) is one of the top ten data mining algorithms. It is simple and effective but has a time complexity that is the product of the number of instances and the number of dimensions. When the number of dimensions is greater than two there are no known solutions that can guarantee a sublinear retrieval time. This paper describes and evaluates two ways to make NNS efficient for datasets that are arbitrarily large in the number of instances and dimensions. The methods are best described as heuristic as they are neither exact nor approximate. Both stem from recent developments in the field of data stream classification. The first uses Hoeffding Trees, an extension of decision trees to streams and the second is a direct stream extension of NNS. The methods are evaluated in terms of their accuracy and the time taken to find the neighbours. Results show that the methods are competitive with NNS in terms of accuracy but significantly faster.

year: 2008

title: Employee intention to leave a job: A case of Malaysian fast food industry

authors: Ghazali, Hazrina

subjects: Employee intention to leave a job

abstract: This thesis explores the determinants of employees‟ turnover intentions in the fast food industry of Peninsular Malaysia and uses as determining variables items related to ‘job stressors’, ‘job stress’, ‘job satisfaction’ and ‘commitment’. This thesis also created one additional variable, ‘Job feeling‟ which was designed to include items relating to Malaysian’s cultural context such as the practice of religion at the workplace. Data derived from a self completed questionnaire comprises the major part of this thesis, and this was distributed to employees working in Peninsular Malaysia’s fast food industry. In addition, the interviews were completed with Managers at the Head offices and ten employees were also interviewed to gather information on job stress issues. The analysis of survey was done using SPSS 14.0 while interviews were translated and transcribed manually. The sample comprised 806 respondents from major international fast food chains operating in Malaysia, and the research is restricted to these companies and does not cover hawkers who also provide fast food in the market places and alleys of Malaysia. As in other countries, the workforce is generally young and it is recognised that not all wish to pursue a career in the fast food industry. Yet even so, on evidence derived from the managers at head offices, the labour turnover rates exceed 100 percent, and thus the issue of labour turnover is one of significance. The results of this thesis indicated that among the determinants, scores on job stress items provides evidence that permits a prediction of employees’ intention to leave a job in the Peninsular Malaysia fast food industry as based on data derived from multiple regression statistical techniques. Further, results found a ‘feeling of being burnt-out’ had the strongest correlation with employee intention to leave. These employees have thought of leaving their present job because they felt stress that, it is thought, arose from factors such as frequent customers’ contact and work pressure. In terms of correlations with socio-demographic variables, the overall results suggest that there were few significant differences between stressors, stress, feeling about the job and satisfaction and commitment, and where statistical significant findings emerged, it was found that, in absolute terms, the differences were minimal and generally derived from the same part of the scale (e.g. there existed a tendency to agreement or disagreement with items. The role of gender, age, marital status or length of employment appears therefore to be a minor discriminating factor. On the other hand the findings suggest that managers could pay attention to features of peer group adherence within the young employees, as some findings suggest that even workers who have few complaints might think more often of leaving their job if members of their ‘crew’ are of that opinion. From a managerial perspective, this study shed light by providing information about employees’ intention to leave a job in the Peninsular Malaysia fast food industry. As this study is the first such study in the Malaysian context, the findings, it is hoped will help the managers at the Head offices to better monitor their employees before they actually leave. The results from this study potentially may identify characteristics of those who may be susceptible to having a higher intention to leave. From a conceptual perspective, the study shows that many of the findings found in the literature derived from the English speaking world are applicable to Malaysia, but in part this may be because current management practices tend to respect Islamic beliefs and thus this did not emerge as an issue. However, the attention to peer groups has not been generally picked up in that literature that does exist with reference to labour turnover in the fast food industry. The limitations that exist within the study that inhibit possible generalisation relate to not only the geographical restriction to Peninsular Malaysia, but also primarily to the fact that the sample were all currently working within the industry. A lack of resources and time might be highlighted that it was not possible to address questions to those who had already left the industry, but it might be claimed that management are primarily concerned with current rather than past employees.

text: Employee intention to leave a job: A case of Malaysian fast food industry This thesis explores the determinants of employees‟ turnover intentions in the fast food industry of Peninsular Malaysia and uses as determining variables items related to ‘job stressors’, ‘job stress’, ‘job satisfaction’ and ‘commitment’. This thesis also created one additional variable, ‘Job feeling‟ which was designed to include items relating to Malaysian’s cultural context such as the practice of religion at the workplace. Data derived from a self completed questionnaire comprises the major part of this thesis, and this was distributed to employees working in Peninsular Malaysia’s fast food industry. In addition, the interviews were completed with Managers at the Head offices and ten employees were also interviewed to gather information on job stress issues. The analysis of survey was done using SPSS 14.0 while interviews were translated and transcribed manually. The sample comprised 806 respondents from major international fast food chains operating in Malaysia, and the research is restricted to these companies and does not cover hawkers who also provide fast food in the market places and alleys of Malaysia. As in other countries, the workforce is generally young and it is recognised that not all wish to pursue a career in the fast food industry. Yet even so, on evidence derived from the managers at head offices, the labour turnover rates exceed 100 percent, and thus the issue of labour turnover is one of significance. The results of this thesis indicated that among the determinants, scores on job stress items provides evidence that permits a prediction of employees’ intention to leave a job in the Peninsular Malaysia fast food industry as based on data derived from multiple regression statistical techniques. Further, results found a ‘feeling of being burnt-out’ had the strongest correlation with employee intention to leave. These employees have thought of leaving their present job because they felt stress that, it is thought, arose from factors such as frequent customers’ contact and work pressure. In terms of correlations with socio-demographic variables, the overall results suggest that there were few significant differences between stressors, stress, feeling about the job and satisfaction and commitment, and where statistical significant findings emerged, it was found that, in absolute terms, the differences were minimal and generally derived from the same part of the scale (e.g. there existed a tendency to agreement or disagreement with items. The role of gender, age, marital status or length of employment appears therefore to be a minor discriminating factor. On the other hand the findings suggest that managers could pay attention to features of peer group adherence within the young employees, as some findings suggest that even workers who have few complaints might think more often of leaving their job if members of their ‘crew’ are of that opinion. From a managerial perspective, this study shed light by providing information about employees’ intention to leave a job in the Peninsular Malaysia fast food industry. As this study is the first such study in the Malaysian context, the findings, it is hoped will help the managers at the Head offices to better monitor their employees before they actually leave. The results from this study potentially may identify characteristics of those who may be susceptible to having a higher intention to leave. From a conceptual perspective, the study shows that many of the findings found in the literature derived from the English speaking world are applicable to Malaysia, but in part this may be because current management practices tend to respect Islamic beliefs and thus this did not emerge as an issue. However, the attention to peer groups has not been generally picked up in that literature that does exist with reference to labour turnover in the fast food industry. The limitations that exist within the study that inhibit possible generalisation relate to not only the geographical restriction to Peninsular Malaysia, but also primarily to the fact that the sample were all currently working within the industry. A lack of resources and time might be highlighted that it was not possible to address questions to those who had already left the industry, but it might be claimed that management are primarily concerned with current rather than past employees.

year: 2010

title: Kia mau ki tō Māoritanga - The role of Māori teachers in English medium primary schools

authors: Coffin, Rachel Marie

subjects: Māori  teachers

abstract: The achievement levels between Māori and non-Māori students remains increasingly wide within a westernised education system. This system has continued to perpetuate the ongoing failure of Māori students. We need to look at ways in which Māori students can best be supported in English medium education settings as these are where the majority of Māori students receive their schooling, and how we can close the gap between Māori and non-Māori achievement. 

Māori teachers are a minority group within English medium education and their potential to raise Māori student achievement is often overlooked (Lee, 2009). This thesis used a case study approach framed by kaupapa Māori methodology to examine how one primary school, whose Māori students are achieving at similar levels to their non-Māori peers, utilises Māori staff to enhance the cultural pedagogy of the school and how this contributes to the success of Māori students.

The literature review takes an historic look at Māori within a westernised education system and looks at how Māori underachievement is not a recent occurrence but an ongoing issue, dating back over one hundred years.  It draws on international literature around the experiences of other indigenous peoples who have experienced colonisation, and highlights the similar struggles that they have had, and continue to have as minority students. 

The literature review also looks at the ways in which indigenous peoples are working to lift indigenous achievement and the role of indigenous teachers in supporting this process. It looks at the role that culture plays in the belief of indigenous peoples in their own ability to succeed, which is referred to in this thesis as self-efficacy (Bandura, 1997, Schunk, 1986).

In contrast to this  students with low self-efficacy will typically avoid difficult tasks in order to minimize risk to self-worth and protect self-esteem (McRae et al., 2010). 

The findings indicate that Māori teachers at Te Kauri School have some level of proficiency in tikanga and te reo Māori and that this plays a vital role in the schools ability to create a culturally responsive learning environment. The Māori staff have the support of the school leadership team, which promotes and values the inclusion of tikanga and te reo Māori. 

This culturally responsive environment instils in Māori students at Te Kauri School a sense of pride in who they are as culturally located beings. This pride means that they do not feel pressure to conform to the ways of the dominant culture, rather that they are able to be Māori. This also corresponds with achievement data for the school, which shows that Māori achievement levels are at similar levels to that of non-Māori students, and in some year and gender levels above. 

The findings indicate that the relationship between Māori whānau (families) and the school is vital in creating a supportive environment and that Māori teachers are especially valuable in this process. Having cultural practices such as kapa haka, waiata and karakia give Māori whānau a connection to the school and provide them with an opportunity to support not only their children but also the school community. 

The findings also indicate that Māori staff and whānau participants view Māori teachers as role models and that having Māori role models within the school adds to Māori student’s sense of pride in being Māori, thus enhancing their self-efficacy and success.

text: Kia mau ki tō Māoritanga - The role of Māori teachers in English medium primary schools The achievement levels between Māori and non-Māori students remains increasingly wide within a westernised education system. This system has continued to perpetuate the ongoing failure of Māori students. We need to look at ways in which Māori students can best be supported in English medium education settings as these are where the majority of Māori students receive their schooling, and how we can close the gap between Māori and non-Māori achievement. 

Māori teachers are a minority group within English medium education and their potential to raise Māori student achievement is often overlooked (Lee, 2009). This thesis used a case study approach framed by kaupapa Māori methodology to examine how one primary school, whose Māori students are achieving at similar levels to their non-Māori peers, utilises Māori staff to enhance the cultural pedagogy of the school and how this contributes to the success of Māori students.

The literature review takes an historic look at Māori within a westernised education system and looks at how Māori underachievement is not a recent occurrence but an ongoing issue, dating back over one hundred years.  It draws on international literature around the experiences of other indigenous peoples who have experienced colonisation, and highlights the similar struggles that they have had, and continue to have as minority students. 

The literature review also looks at the ways in which indigenous peoples are working to lift indigenous achievement and the role of indigenous teachers in supporting this process. It looks at the role that culture plays in the belief of indigenous peoples in their own ability to succeed, which is referred to in this thesis as self-efficacy (Bandura, 1997, Schunk, 1986).

In contrast to this  students with low self-efficacy will typically avoid difficult tasks in order to minimize risk to self-worth and protect self-esteem (McRae et al., 2010). 

The findings indicate that Māori teachers at Te Kauri School have some level of proficiency in tikanga and te reo Māori and that this plays a vital role in the schools ability to create a culturally responsive learning environment. The Māori staff have the support of the school leadership team, which promotes and values the inclusion of tikanga and te reo Māori. 

This culturally responsive environment instils in Māori students at Te Kauri School a sense of pride in who they are as culturally located beings. This pride means that they do not feel pressure to conform to the ways of the dominant culture, rather that they are able to be Māori. This also corresponds with achievement data for the school, which shows that Māori achievement levels are at similar levels to that of non-Māori students, and in some year and gender levels above. 

The findings indicate that the relationship between Māori whānau (families) and the school is vital in creating a supportive environment and that Māori teachers are especially valuable in this process. Having cultural practices such as kapa haka, waiata and karakia give Māori whānau a connection to the school and provide them with an opportunity to support not only their children but also the school community. 

The findings also indicate that Māori staff and whānau participants view Māori teachers as role models and that having Māori role models within the school adds to Māori student’s sense of pride in being Māori, thus enhancing their self-efficacy and success.

year: 2013