Faculty of Education - Theses
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ItemApplications of item response theory to identify and correct for suspect rater data( 2006)This thesis describes a plausible values imputation approach for deriving population estimates on several language proficiency domains. The approach harnessed a multi-dimensional item response analysis combining student responses, rater judgements and student background variables. The target student population was lower grade primary school students enrolled in the Hong Kong schooling system. The raters consisted of local teachers of English employed within the sampled target schools. The primary objective of this research was to impute plausible values where no data was provided or where rater data was deemed suspect. By necessity, a secondary objective of this study was to establish rules for justly excluding particular data on the basis of questionable validity. Surveys such as TIMSS, PISA and NAEP have used such "plausible value" methodologies to account for incomplete test designs and person non-response (Beaton & Johnson, 1990; Yamamoto & Kulick, 2000; Adams & Wu, 2002). The point of difference between this study and other similar studies was the use of item response theory (in particular plausible values imputation) to identify and correct for invalid rater judgements in a large-scale educational survey. An additional research outcome included a derived index of rater data quality based upon imputation scores.
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ItemCaught in the middle : teachers' perceptions of the usefulness of the Record of oral language when used with ESL students( 2004)In the present educational context, large-scale literacy reform has been hotly debated in the media by various stakeholders while on the other hand the " voice that has been largely absent from these debates has been that of teachers". This study attempts to correct this imbalance by reporting on a study of teachers' perceptions of the usefulness of the ROL as a testing tool for students learning English as a second language. It was designed to offer the researcher, the participants and other stakeholders great insight into the current complexities that teachers face when assessing the oral competence of students learning English as a second language. Teachers were given the opportunity to critically examine their own assumptions, beliefs and practices about oral language learning and assessment and challenge the current use of the ROL in the Children's Literacy Success Strategy (CLaSS) program. A qualitative case study approach was selected to allow the voices of the participants and the researcher to be heard in a familiar setting. Thirty minute semi-structured interviews were conducted separately so that teachers could speak freely thus enabling the researcher to follow individual trains of thought and obtain in-depth responses. The study concluded that the usefulness of the Record of Oral Language as a testing tool for students from language backgrounds other than English was not the central issue. Research findings instead highlighted the difficulties faced by mainstream teachers expected to effectively assess the oral language skills of students for whom English is a second language without effective Professional Development support. The central issue that has emerged in this study is the place of teacher professional knowledge for these teachers of ESL students. Not only are ESL students disadvantaged in the current educational climate but so are the mainstream teachers. Teachers' responses to this study reaffirm the need for Professional Development in ESL pedagogy as a way to effectively support the Oral Language and Literacy Learning of ESL which was valued pre Literacy Advance.