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Validity-and-Reliability for research ppt
- 1. Validity and Reliability Understanding theconcepts of validity and reliability is essential for conducting credible research. Validity refers to the accuracy of a measurement, while reliability focuses on the consistency of measurements. by Maryjoy Poquiz
- 2. Concept of Validityin Research Validity refers to the extent to which a research instrument measures what it is intended to measure. 1 Essential For Credibility Ensuring validity is crucial for establishing the credibility and trustworthiness of research findings. 2 Multiple Types There are different types of validity, each focusing on specific aspects of measurement accuracy. 3 Influences Interpretation Understanding validity helps researchers interpret results accurately and draw meaningful conclusions. 4 Underlying Concept Validity is a foundational concept in research methodology, guiding the design and interpretation of studies.
- 3. Types of Validity Differenttypes of validity address specific aspects of measurement accuracy, ensuring research instruments capture the intended constructs. Content Validity Measures how well the content of a test represents the domain it aims to assess. Construct Validity Measures how well a test measures the underlying theoretical construct it is designed to assess. Criterion Validity Measures how well a test predicts or correlates with an external criterion or measure.
- 4. Content Validity Content validityis crucial for ensuring a test accurately reflects the knowledge or skills it aims to assess. Relevance to Domain The items on the test should be relevant to the specific content or skills being measured. Representative Sampling The test should include a representative sample of the content domain. Expert Judgement Content validity is often assessed by experts in the field who evaluate the relevance and comprehensiveness of the test items.
- 5. Construct Validity Construct validityis essential for ensuring a test measures the intended theoretical concept or construct. Theoretical Construct The test is designed to measure a specific theoretical construct. Observed Scores The test results are compared to the theoretical construct. Convergent & Discriminant Validity The test should correlate with other measures of the same construct (convergent) and not correlate with measures of different constructs (discriminant).
- 6. Criterion Validity Criterion validityis essential for ensuring a test can accurately predict or correlate with an external criterion. Predictive Validity Measures how well a test predicts future performance on a related criterion. Concurrent Validity Measures how well a test correlates with a current criterion measure.
- 7. Threats to Validity Threatsto validity can compromise the accuracy of research findings and undermine the credibility of the study. Bias Systematic errors or distortions that can influence research results. Confounding Variables Uncontrolled factors that can influence the relationship between variables. Sampling Errors When the sample does not accurately represent the target population. Measurement Errors Inaccuracies or inconsistencies in the measurement process.
- 8. Concept of Reliability Reliabilityrefers to the consistency and stability of a measurement instrument over time and across different situations. 1 Test-Retest Reliability Consistency of scores over repeated administrations of the same test. 2 Internal Consistency Consistency of scores across different items within a single test. 3 Inter-Rater Reliability Consistency of scores obtained by different raters or observers.
- 9. Conclusion Validity and reliabilityare fundamental concepts in research. They ensure the accuracy and consistency of research findings, enhancing the credibility and trustworthiness of research outcomes.