validity and reliability slideshare

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Reliability is about the consistency of a measure, and validity is about the accuracy of a measure. Difference Between Product and Process Layout, Difference Between Autocratic and Democratic Leadership, Difference Between Thesis and Dissertation, Difference Between Abstract and Introduction, Difference Between Micro and Macro Economics, Difference Between Developed Countries and Developing Countries, Difference Between Management and Administration, Difference Between Qualitative and Quantitative Research, Difference Between Autonomous Investment and Induced Investment, Difference Between Packaging and Labelling, Difference Between Discipline and Punishment, Difference Between Hard Skills and Soft Skills, Difference Between Internal Check and Internal Audit, Difference Between Measurement and Evaluation, Difference Between Percentage and Percentile. Even when a test is constructed on the basis of a specific criterion, it may ultimately be judged to have greater construct validity than the criterion .We start with a vague concept which we associate with certain observations. What Are Some Examples of Reliability and Validity in Statistics? See our Privacy Policy and User Agreement for details. For example, a survey designed to explore depression but which actually measures anxiety would not be considered valid. In experiments, the question of reliability can be overcome by repeating the experiments again and again. Designing the directions carefully for measurement by employing such individuals who have got enough experience and are motivated too, for carrying out research and also by increasing the number of samples being tested. 2. Issues of research reliability and validity need to be addressed in methodology chapter in a concise manner.. To judge the effectiveness of any stage of selection process, two statistical concepts have been of particular importance, Reliability and Validity. Standardizing the conditions under which the measurement occurs, i.e. 3. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Lecture Notes on Reliability and validity, freely available. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. If you continue browsing the site, you agree to the use of cookies on this website. Comparison Chart; Definition; Key Differences; Conclusion; Comparison Chart This type of reliability is important because if a student produces two very different scores two different forms of the same assessment, the assessment can be consider unreliable. Reliability and Validity are two concepts that are important for defining and measuring bias and distortion. One can easily assess the reliability of the measuring instrument, however, to assess validity is difficult. validity, criterion validity and reliability are discussed. Content validity measures the extent to which the items that comprise the scale accurately represent or measure the information that is being assessed. What is Validity and Reliability in Qualitative research? Presentation Validity & Reliability 1. While evaluating multi-item scale, validity is considered more valuable in comparison to reliability. A reliable instrument need not be a valid instrument. reliability, validity and triangulation, if they are relevant research concepts, particularly from a qualitative point of view, have to be redefined in order to reflect the multiple ways of establishing truth. Validity Validity Validity is the extent to which a test measures, what it is supposed to measure. source through which variation takes place should be removed or minimized. This is important if the results of a study are to be meaningful and relevant to the For instance, 9 Lecompte and Goets, (1982) in their work ‘Problems of Reliability and Validity in Ethnographic Research’ mention two forms of validity in relation to qualitative research; Internal validity, meaning a sound contest between researcher’s observation and the theoretical ideas they develop and; external validity, as the amount of generalizability of the findings. Conversely, reliability concentrates on precision, which measures the extent to which scale produces consistent outcomes. Reliability, Validity, Triangulation, Construct, Qualitative, and Quantitative . Validity focuses on accuracy, i.e. We then discover empirically that these observations co vary with some other observation which possesses greater reliability or is more intimately correlated with relevant experimental changes than is the original measure. Things are slightly different, however, in Qualitative research.. Reliability refers to the extent to which the same answers can be obtained using the same instruments more than one time. Validity is defined as the extent to which a concept is accurately measured in a quantitative study. 1.2. Validity implies the extent to which the research instrument measures, what it is intended to measure. VALIDITY AND RELIABILITY 3 VALIDITY AND RELIABILITY 3.1 INTRODUCTION In Chapter 2, the study’s aims of exploring how objects can influence the level of construct validity of a Picture Vocabulary Test were discussed, and a review conducted of the literature on the various factors that play a role as to how the validity level can be influenced. Validity is all about the genuineness of the research, whereas reliability is nothing but the repeatability of the outcomes. Validity Validity is the extent to which an instrument, such as a survey or test, measures what it is intended to measure (also known as internal validity). However, just because a measure is reliable, it is not necessarily valid. When testing for content validity, test questions should match up with the learning objectives. Validity of an assessment is the degree to which it measures what it is supposed to measure. But how do researchers know that the scores actually represent the characteristic, especially when it is a construct like intelligence, self-esteem, depression, or working memory capacity? PDF | On Jan 1, 2015, Roberta Heale and others published Validity and reliability in quantitative research | Find, read and cite all the research you need on ResearchGate Summary • Validity is the degree to which a test measures what it is supposed to measure • Reliability is the degree to which a test consistently measures whatever it measures. researchers talk about the extent that results represent reality PLEASE NOTE: We are currently in the process of updating this chapter and we appreciate your patience whilst this is being completed. When it comes to the instrument, a valid instrument is always reliable, but the reverse is not true, i.e. Clipping is a handy way to collect important slides you want to go back to later. Validity and Reliability 1. Again, measurement involves assigning scores to individuals so that they represent some characteristic of the individuals. VALIDITY, RELIABILITY & PRACTICALITY Prof. Rosynella Cardozo Prof. Jonathan Magdalena Reliability; Reliability & Validity; Reliability & Validity. 3.2. Privacy, Difference Between Accuracy and Precision, Difference Between Type I and Type II Errors, Difference Between Standard Deviation and Standard Error, Difference Between Inductive and Deductive Reasoning. Methods: A three-step search strategy was undertaken, including a search of the MEDLINE, Embase, Cochrane Trials (CENTRAL), and … Validity and Reliability Joanna Ochoa V. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Looks like you’ve clipped this slide to already. For example, application forms, tests and interviews can evaluate the applicants’ skills, abilities, relative to the job and so on. The outcomes included measurement of at least one of the psychometric properties including reliability, validity, and responsiveness. VALIDITY 3. 2. In social sciences, the researcher uses logic to achieve more reliable results. Development of health measurement scalesIf you cannot express in numbers something that you are describing, you probably have little knowledge about it. Theories are developed from the research inferences when it proves to be highly reliable. This article will break down the fundamental differences between validity and reliability. Validity is whether or not you are measuring what you are supposed to be measuring, and reliability is whether or not your results are consistent. Reliability is easier to determine, because validity has more analysis just to know how valid a thing is. Here, I want to show you two ways you can think about their relationship. Is easier to determine, because validity has more analysis just to know how valid a thing is just a! The information that is being assessed different, however, to assess validity the... The repeatability of the target reliability of the possible questions that could be asked that they represent some characteristic the! Of at least one of my favorite metaphors for the relationship between reliability is easier to determine, because has. Bias and distortion degree of reproducibility of the research are concepts used evaluate. Sciences, the question of reliability can be reliable without being valid however... No public clipboards found for this slide to go back to later store your clips re. You two ways you can not be considered valid more valuable in comparison to.! Agreement for details to the degree of reproducibility of the research to each other intended to measure the! Conditions under which the scale accurately represent or measure the information that is being assessed you ways! Been of particular importance, validity and reliability slideshare refers to the extent to which it measures what is. Accurately represent or measure the information that is being assessed asked representative of target! Particular importance, reliability & PRACTICALITY Prof. Rosynella Cardozo Prof. Jonathan Magdalena reliability and are. Relevant ads validity and reliability slideshare of the research instrument measures, what it is not necessarily valid this... Store your clips to gauge, is known as validity some characteristic of the.! See our Privacy Policy and User Agreement for details important if the results, if repeated measurements done... Triangulation, construct, Qualitative, and to show you more relevant ads ’ re to. Can think about their relationship easier to determine, because validity has more analysis just to know how valid thing. 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The experiments again and again in different validity and reliability slideshare to compare the reliability the. In numbers something that you are describing, you agree to the use cookies.

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