The Psychometric Properties of the Early Development Instrument: A Rasch Analysis Based on Swedish Pilot Data
- 399 Downloads
The Early Development Instrument (EDI) is a population measure and an indicator of children’s developmental health before entering the school system. EDI-Sweden was translated and adapted from EDI-Canada. In 2011 a pilot study was conducted, as a first step of the preparations for nationwide implementation of EDI in Sweden. The purpose of the study is to analyse the psychometric properties of EDI-Sweden. Data about 116 5-year-old children were collected at ten preschools in two municipalities. EDI consists of 104 core items in five domains: physical health and well-being, social competence, emotional maturity, language and cognitive development, communication skills and general knowledge. Preschool teachers completed a web based questionnaire for each child. The data were analysed using the unidimensional Rasch model. With exception for the domain of physical health and well-being the Rasch analysis showed satisfying psychometric properties of EDI after removal of some misfitting items. In these four domains no items showed disordered thresholds and the reliability was good, indicated by person separation index values of 0.73 or higher. Tentative analyses of Differential Item Functioning (DIF) showed that some items didn’t work invariantly across genders, suggesting that the DIF-items should be split into gender specific items. Due to the relatively small sample size the results can’t provide definite answers but tentative indications of the psychometric properties of the EDI-Sweden. As a whole the Rasch analysis provides ground for cautious optimism for large scale assessment of EDI-Sweden enabling more thorough and finer level analysis of the instrument.
KeywordsChildren EDI Preschools Psychometric Rasch Sweden
A previous version of this paper was presented at the 16th International Objective Measurement Workshop in Vancouver, Canada, April 11–12, 2012. Our thanks to Associate Professor Magdalena Janus at the Offord Centre, McMaster University Canada for valuable comments on an earlier draft of this paper.
- Andrich, D., Sheridan, B. S., & Luo, G. (2010). RUMM2030: Rasch unidimensional models for measurement. Perth, WA: RUMM Laboratory.Google Scholar
- Andrich, D., & Styles, I. (2004). Final report on the psychometric analysis of the Early Development Instrument (EDI) using the Rasch model: A technical paper commissioned for the development of the Australian Early Development Instrument (AEDI). Perth, WA: Murdoch University.Google Scholar
- Andrich, D., & Styles, I. (2005). Report on the Rasch analysis of the Australian Early Development Instrument (AEDI) using 2004 data from 6 states. Perth, WA: School of Education, Murdoch University.Google Scholar
- Australian Government. (2013). A Snapshot of Early Childhood Development in Australia 2012—AEDI National Report, Australian Government, Canberra. Retrieved from http://www.rch.org.au/uploadedFiles/Main/Content/aedi/Report_NationalReport_2012_1304(1).pdf. Accessed on 30 April 2013.Google Scholar
- Centre for Community Child Health and Telethon Institute for Child Health Research. (2009). A Snapshot of Early Childhood Development in Australia—AEDI National Report 2009, Australian Government, Canberra. (Re-issue March 2011). Retrieved from http://www.rch.org.au/uploadedFiles/Main/Content/aedi/Report_NationalReport2011Reissue_1103.pdf. Accessed on 30 April 2013.
- Janus, M., Brinkman, S., Duku, E., Hertzman, C., Santos, R., Sayers, M., et al. (2007). The Early Development Instrument: A population-based measure for communities: A handbook on development, properties, and use. Hamilton, ON: Offord Centre for Child Studies.Google Scholar
- KVA. (2010). State-of-the-science conference statement on trends in child and adolescent mental health in Sweden, 12–14 April 2010. The Royal Swedish Academy of Sciences Health Committee.Google Scholar
- Offord Centre for Child Studies. (2013). Equity from the start: 10 Years of the EDI & beyond international conference, http://www.offordcentre.com/conference/edi_home.html. Accessed on 30 April 2013.
- Rasch, G. (1960/1980). Probabilistic models for some intelligence and attainment tests. (Copenhagen, Danish Institute for Educational Research). Expanded edition (1980) with foreword and afterword by B. D.Wright, (1980). Chicago: The University of Chicago Press.Google Scholar