Reliability is an essential characteristic of a good test. It is a way to give coherence and therefore the reliability of results by the students, even if repeated on several occasions and forms reached. Reliability can be "a measure of the consistency of results across different evaluators will be established for different periods. It is used to support elements of the level of scrutiny given to the candidates and get the real feel of his ability.
To eliminate reliabilityInconsistency arising from any error of measurement. Accorded the status of virtually any test can be considered absolutely reliable and completely trustworthy, because mistakes from time to time and situation to situation, which disagreements, because there are a lot of human errors and their perceptions. Would you take an example given on the same students on two separate occasions tests show the same values. In addition, the notes would be equal if the same test is altered in several ways. TheEffort has to increase the reliability by limiting the inevitable errors in measurement.
It is worth considering the factors that mean errors in the measurement of the test score to help leading to reduced reliability
• Faulty and inadequate samples: The content of the test must be complete with quality and quantity of opportunities guess work easier. The content of the test should have sufficient number of questions and these questions shouldexcellent quality and the intention to have a thorough knowledge of the candidate assess. Manage should be sure to put the correct number of test items that are no more and no less, and better quality. The elements of the sample test should be able to assess and distinguish the candidates what they earn and help with the assignment of reliability to the test. The test, if they should rise to various forms and manage to show consistent results. The test questions show the bestResults in terms of consistency and reliability when they brought in ascending order of difficulty. All too easy and difficult questions, if they are clustered together with little variation in the assessments of performance and reliability, and thus lowered the true test of skills.
• The language used in the construction of the test samples should be clear and be free of multiple interpretations.
• The environmental factors also play a role in extending the test resultsthe student. Extreme climate, noise, dim light, different test times to different student has to bring an influence on errors in line with the actual measurement of the caliber of the candidate. Personal factors such as poor health of the pupils, anxiety also affects performance in a big way.
• Correct contribute to health care benefits test scores also help to close, reliability and consistency correspond to the test. The examination is a right mix of objective testing as well as subjective essay type questions. Objective testshelp to decipher more precisely different services.
Type of reliability
• Test-retest reliability: This means that the test administered on the same candidates at least twice at different points of time and then correlated to ensure the reliability of the results. The correlations between zero is low, the reliability and high reliability 1 indicates. For example, children of class IX, the subject of an objective test or quiz on the biology are in April. After theirPromotion of class X, they are again on the same test set in December, there are likely to have different opinions.
• Alternative forms: Manage test 1 test to a group and then administer 2 to the same group and correlate the results.
• Split Half Reliability: It is to compare test results between the two groups of elements in the same test.
• Inter-rater reliability: Two or more independent inspectors / markers for the same test to increase the coherence and thus the reliability ofScores achieved by the candidate.
• Internal consistency: This is commonly referred to as Cronbach's alpha, which supports the Article correlations measured. The questions on the same topic are asked in a number of ways to help in dispensing more consistent. Alpha, 90 reflects the high level of reliability, 80 is of moderate reliability, and, 70 is of low reliability.
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