DNB CET July 2014 Result Equating and Scaling
The question paper of DNB-CET comprises of 200 multiple choice questions each with four options and only one correct response.
Multiple question papers are used for DNB-CET for different sessions and days.
A standard psychometrically-sound approach is employed for the scoring process of DNB CET. This approach has been applied to score all large scale Computer Based Examination utilizing multiple question papers.
- While all papers (forms) are carefully assembled to ensure that the content is comparable, the difficulty of each form may be perceived by different subjects undertaking the test to slightly vary. Such minor differences in the overall difficulty level are accurately measured after all the different question papers (forms) have been administered and the results analyzed. A post-equating process is necessary to ensure validity and fairness.
- Equating is a psychometric process to adjust differences in difficulty so that performance from different test papers (forms) are comparable on a common metric and therefore fair to candidates testing across multiple papers (forms).
- During post-equating, test items are concurrently analyzed and the estimated item parameters (item difficulty and discrimination) are put onto a common metric. Item Response Theory (IRT), a psychometrically supported statistical model, is utilized in this process.
- The result is a score that takes into account the performance of the candidate along with the difficulty of the form administered.
In order to ensure appropriate interpretation of performance, the scores must be placed on a common scale or metric. A linear transformation is used for this scaling process, which is a standard practice for such test administration.
Post equating takes into account any statistical differences in examination difficulty and ensures all candidates are evaluated on a common scale. The aforesaid steps ensure that all examination scores are valid, equitable and fair. Merit List shall be prepared on the basis of scores obtained by the candidates.
There is no provision for re-checking / re-totaling / re-evaluation of the question paper, answers, score and no query in this regard shall be entertained.