Aktuelle Tendenzen / Current Trends
Edited By Rüdiger Grotjahn
C-Tests consist of several short texts in which the missing parts of words have to be reconstructed. C-Tests have excellent psychometric properties and are used in many contexts as economical tests of language proficiency. This collection of papers illustrates the state of the art of C-Test research. It focuses on face validity and washback of C-Tests, C-Test performance and intelligence, C-Tests as screening devices for TestDaF and SIMTEST, ROC analyses for relating C-Test scores to the CEFR as well as use of C-tests in the classroom. A special feature of the volume is the editor’s comprehensive C-Test bibliography.
Construction and validation of a C-Test in Persian
In this study a five-item Persian C-Test is developed and administered to a sample of Iranian junior and senior high school students aged 12–17. Rasch analysis revealed perfect fit of the data to the model which supported unidimensionality of the C-Test. Principal component analysis of standardized residuals also confirmed the unidimensionality of the instrument. Classical analyses such as Cronbach’s alpha reliability, inter item correlation indices and corrected item-total correlations also corroborated the homogeneity of the construct measured by the C-Test and satisfactory discrimination power of the items. Item-person map and thresholds map indicated that the test is only capable of distinguishing among lower-ability test-takers and cannot separate higher-ability test-takers. This finding was confirmed by one-way analysis of variance.