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.
The validity of C-Tests as measures of academic and everyday language proficiency: A multidimensional item response modeling study
Purya Baghaei & Rüdiger Grotjahn*
In this study we reanalyzed Daller & Grotjahn’s (1999) C-Test data. A C-Test battery composed of three academic and three everyday language texts was analysed with a unidimensional and a multidimensional Rasch model. Results showed that a two-dimensional model, where academic and everyday language texts define two separate dimensions, fitted the data significantly better than a unidimensional model where all six texts load on a single dimension.It is argued that text genre affects mental processing in C-Test taking and as a result affects what a C-Test measures. The findings show the potential of C-Tests, which are based on a careful and informed selection of texts, for measuring different components of language proficiency.