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Rasch analysis of a collection of Astronomy items

Athanasios Verdis; Spyridon Kokkotas; Evi Panou

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  "inLanguage": {
    "alternateName": "ell", 
    "@type": "Language", 
    "name": "Modern Greek (1453-)"
  "description": "<p>This paper examines how Rasch analysis and Principal Components Analysis have been used complementarily in the evaluation of an astronomy course. Twelve dichotomous items were presented to 134 secondary school students in Greece. The items evaluated a STEM project, with emphasis on its Astronomy component. Nonlinear Principal Components analysis and Rasch analysis are compared regarding the issue of unidimensionality. It is argued that non-linear Principal Component Analysis offers safer criteria for suggesting unidimensionality but at the same time Rasch&nbsp;analysis&nbsp;provides more information regarding items&rsquo; difficulty and participants&rsquo; ability.</p>", 
  "license": "", 
  "creator": [
      "affiliation": "Research Paths", 
      "@type": "Person", 
      "name": "Athanasios Verdis"
      "affiliation": "Research Paths", 
      "@type": "Person", 
      "name": "Spyridon Kokkotas"
      "affiliation": "Research Paths", 
      "@type": "Person", 
      "name": "Evi Panou"
  "url": "", 
  "datePublished": "2018-10-24", 
  "@type": "PresentationDigitalDocument", 
  "keywords": [
    "Rasch analysis"
  "@context": "", 
  "identifier": "", 
  "@id": "", 
  "workFeatured": {
    "alternateName": "ELETEA", 
    "location": "Athens, Greece", 
    "@type": "Event", 
    "name": "2nd Conference of the Hellenic Association for Educational Assessment"
  "name": "Rasch analysis of a collection of Astronomy items"
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