Reliability and its types: Split half method and test retest methods

Reliability and its types:
Split half method
Test retest methods

1. SPLIT HALF AND TEST-RETEST METHODS AAMIR HUSSAIN EPM 4 TH NUML, ISLAMABAD

2. INTRODUCTION 'Reliability' of any research is the degree to which it gives an accurate score across a range of measurement. It can thus be viewed as being 'repeatability' or 'consistency'.

3. TYPES 1-Inter Rater 2-Split Half Method 3-Test Retest Method 4-Parrallel Form 5-Internal Consistency

4. SPLIT HALF METHOD A test for a single knowledge area is split into two parts and then both parts given to one group of students at the same time.

5. SPLIT HALF METHOD Split-half testing is a measure of internal consistency. How well the test components contribute to the construct that’s being measured. It is most commonly used for multiple choice tests you can theoretically use it for any type of test—even tests with essay questions.

6. How to Split it half? first half and second half odd and even numbers. If the two halves of the test provide similar results this would suggest that the test has internal reliability.

7. STEPS Administer the test to a large group students (ideally, over about 30). Randomly divide the test questions into two parts. For example, separate even questions from odd questions. Score each half of the test for each student. Find the correlation coefficient for the two halves.

8. TEST RETEST Test-retest reliability refers to the extent to which a test or measure  administered at one time is correlated with the same test or measure  administered to the same people at another time.

9. If the correlation between separate administrations of the test is high (e.g. 0.7 or higher as in this Cronbach's alpha-internal consistency-table), then it has good test–retest reliability.

10. CONDITIONS the same experimental tools the same observer the same measuring instrument, used under the same conditions the same location Repetition over a short period of time. same objectives

11. DISADVANTAGES It takes a long time for results to be obtained. If the duration is to brief then participants may recall information from the first test which could bias the results. If the duration is too long it is feasible that the participants could have changed in some important way which could also bias the results.