[…] of a modern day business. Whereas .4 might be considered a moderately impressive value, the same cannot be said for .28. I believe that reliabilty is the most important thing to have when carrying out research as if a study is unrealiable the data will be full of errors and can be misleading, however if a study lacks validity this can be stated in the research report and can spark possible other research into that area. What is the history of Colonel Charles Young related to African American Military History? Although clinical researchers know that it is important to have valid measures, there is insufficient understanding of the role that reliability plays in correlative validity-the extent to which variables are capable of correlating with each other. to its feature contents. […]. These ethical norms in research are extremely important because, Importance Of Reliability In Quantitative Research. what you’re speaking about! There is no guarantee that the same results will occur with a different set of subjects or instrument used at a future point of time. So although there was reliability there was not validity.” (Taken from my blog- http://psuc28.wordpress.com/). However, when assessing whether a study is reliable surely we should also assess whether the study is internally or externally reliable, therefore whether the methodology or the results can be repeated. The present goal is to be specific about the role that reliability plays with respect to validity. The most popular method is Cronbach's Alpha, which produces a reliability coefficient for all possible combinations of a set of items within a scale. For example, Ainsworth and Bell’s study on child attachments, ‘the strange situation’, was a reliable study because it received consistent results when re-conducted (children of certain attachments types were found to act in a way predicted of that attachment type). Not only do you want your measurements to be accurate (i.e., valid), you want to get the same answer every time you use an instrument to measure a variable. This means that it is important that people test for reliability when conducting any form of research. Here a second measurement instrument is developed that is equivalent to the first, and administered to the same subjects. Item-to-item reliability: The reliability of any single item on average (analogous to judge-to-judge reliability, which is the reliability of any single judge on average). If a study is reliable it can have positive implications for other areas of psychology and could be used to improve/aid issues. Literature Review, b. Charles Spearman provided a seminal contribution by working out the precise relation, expressed in modern symbols, as Equation 1 below : where ρXY , is the observed correlation between two variables, ρTXTY is the true correlation or correlation that would be observed with perfect measurement reliability, ρXX and ρYY are the reliabilities of the measures of the two variables. What is the Christian view of the nature of human persons, and which theory of moral status is it compatible with? Define reliability, including the different types and how they are assessed. However, if we carried out an experiment 100 times and the results came back the same every time then it would show that our hypothesis and research is reliable and can therefore be used as scientific evidence. This will ensure construct, external and internal validity and reliability. Change ), 4 Tips That Will Help You Choose The Right Data Centre Provider | TechnoStuffs - The Technology Stuffs, Reliability in Research – Useful Information, https://tasminrl.wordpress.com/2011/09/30/why-is-reliability-important/. Changes in environment / external factors and personal factors could impact responses. It involves using one measuring instrument and assessing its reliability through using different samples or different items within each scale. Predictive validity assesses how well a measurement can predict future actions or behavior. This eliminates the problems that can occur when a survey instrument is administered a second time.