By C. Weir
Checks for the dimension of language talents needs to be built in keeping with a coherent validity framework in line with the newest advancements in idea and perform. This leading edge ebook, by means of a global authority on language checking out, bargains with all key features of language attempt layout and implementation. It presents a street map to powerful trying out according to the most recent methods to check validation. A booklet for all graduate scholars in utilized Linguistics or TESOL, and for pro language lecturers.
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Extra resources for Language Testing and Validation: An Evidence-based Approach (Research and Practice in Applied Linguistics)
In the new volume of the American Educational Research Association, American Psychological Association and National Council on Measurement in Education Standards (AERA/APA/NCME 1999) the revised chapter on ‘Reliability and Errors of Measurement’ (Part 1, section 2) still identifies the broad categories of reliability which have traditionally been recognized in the field: • • • • test–retest reliability; parallel forms reliability; internal consistency; marker reliability. 1 25 Test–retest reliability One obvious way of demonstrating that a test is measuring ability consistently is to give the same test twice to the same group of learners.
KR20 estimates of reliability are very widely used. An equivalent formula is known as Cronbach alpha. , 0, 1 or 2. B. The procedure for calculating KR20 and other reliability statistics is given in Chapter 9. , use of Cronbach’s alpha or KR20). The fact that these coefficients are relatively easy to calculate means that other estimates are not used as commonly. 6 Hughes on the effects of test size Other things being equal, the more items that you have on a test, the more reliable a test will be.
MFR has clear importance for detecting inconsistent individual marker behaviour both over time and in comparison with other markers (see Chapter 9 for a full description of MFR in practice). Once steps have been taken to establish that reliabilities are achieved to an acceptable standard, there is the further area of grade awarding to be considered (see Chapter 9 for further discussion of this procedure). Once scores and grades have been finalized, it is possible to evaluate the test along a range of a posteriori dimensions.
Language Testing and Validation: An Evidence-based Approach (Research and Practice in Applied Linguistics) by C. Weir