Presentation on theme: "Inter-Rater and Test-Retest Reliability of the Early Language and Literacy Classroom Observation (ELLCO) Addie Lafferty Khawla Obeidat Shelley Gray Jeanne."— Presentation transcript:
Inter-Rater and Test-Retest Reliability of the Early Language and Literacy Classroom Observation (ELLCO) Addie Lafferty Khawla Obeidat Shelley Gray Jeanne Wilcox Arizona State University Tempe, Arizona
What is the ELLCO? A set of three interdependent research tools: Literacy Environment Checklist Classroom Observation and Teacher Interview Literacy Activities Rating Scale Developed by Miriam W. Smith & David K. Dickinson, with Angela Sangeorge, & Louisa Anastasopoulos (2002)
What is the purpose of the ELLCO? To identify practices and environmental supports that foster early language and literacy development. Provides objective ratings of the language & literacy environment of classrooms from preschool to third grade.
Literacy Environment Checklist Twenty four items in 5 conceptual categories: Book Area Book Selection Book Use Writing Materials Writing Around The Room
Classroom Observation and Teacher Interview Fourteen classroom observation items grouped into: General Classroom Environment Language & Literacy Curriculum Rated on a 5-point scale 5=exemplary 4=proficient 3=basic 2=limited 1=deficient
Literacy Activities Rating Scale Nine questions in 2 categories: Book reading Writing
Method Purpose: Assess inter-rater and test-retest reliability Procedure: Administered by two certified speech-language pathologists at the same time One was a bilingual Spanish-English speaker One was a monolingual English speaker Two to three week interval between first and second administrations
Characteristics of Participants Participants: 8 Head Start classrooms Three classes of 3- to 4-year-olds Five classes of 4- to 5-year-olds 135 children 115 children identified as English Language Learners Teachers & children spoke Spanish and English throughout the four hour day Teacher demographics: 3 Latino, 3 White, 1 African American, 1 American Indian
Discussion The ELLCO had good inter-rater reliability. The Classroom Observation & Teacher Interview showed good test-retest reliability. The Literacy Environment Checklist showed adequate test- retest reliability. Scores were affected by the presence or absence of classroom materials from Time 1 to Time 2 The Literacy Activities Rating Scale showed poor test-retest reliability. Scores were affected by the presence or absence of book reading and writing activities from Time 1 to Time 2.
Test-Re-test Reliability Concerns with the Literacy Activities Rating Scale The observations at test and re-test were scheduled at the same time of the day and when teachers reported that book reading and writing activities were scheduled to take place. However, the reliability coefficient was affected by scores on the presence of full-group book reading, number of minutes spent on book-reading, observing an adult model writing, and observing an adult help a child write. The observation of these behaviors at one time point and not another was the basis of the poor test-retest reliability found here.
Considerations When Using the ELLCO in Research Consider performing a minimum of two pre-intervention and two post-intervention observations to determine if the scores on the ELLCO are stable and truly representative of the classroom. Predetermine an amount of time to spend on observations to allow for consistent administration. When measuring change in a classroom, schedule the observations at the same time as the first observation and when the teacher reports book reading and writing activities will take place to maximize the possibility of observing assessed behaviors.
Suggestions for Future Research Determination of more controlled directions for performing ELLCO observation. Consideration of how many observations in a given classroom are needed before stability of scores is obtained.