External And Internal Validity

Saturday, February 12, 2022 10:48:37 PM

External And Internal Validity

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What is external validity?

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Under this model, we begin by thinking about different generalizability contexts and developing a theory about which contexts are more like our study and which are less so. For instance, we might imagine several settings that have people who are more similar to the people in our study or people who are less similar. This also holds for times and places. When we place different contexts in terms of their relative similarities, we can call this implicit theoretical a gradient of similarity. Once we have developed this proximal similarity framework, we are able to generalize.

We conclude that we can generalize the results of our study to other persons, places or times that are more like that is, more proximally similar to our study. Notice that here, we can never generalize with certainty — it is always a question of more or less similar. A threat to external validity is an explanation of how you might be wrong in making a generalization. For instance, you conclude that the results of your study which was done in a specific place, with certain types of people, and at a specific time can be generalized to another context for instance, another place, with slightly different people, at a slightly later time. There are three major threats to external validity because there are three ways you could be wrong — people, places or times.

Your critics could come along, for example, and argue that the results of your study are due to the unusual type of people who were in the study. Or, they could argue that it might only work because of the unusual place you did the study in perhaps you did your educational study in a college town with lots of high-achieving educationally-oriented kids. Or, they might suggest that you did your study in a peculiar time. For instance, if you did your smoking cessation study the week after the Surgeon General issues the well-publicized results of the latest smoking and cancer studies, you might get different results than if you had done it the week before.

How can we improve external validity? One way, based on the sampling model, suggests that you do a good job of drawing a sample from a population. For instance, you should use random selection, if possible, rather than a nonrandom procedure. Begin typing your search term above and press enter to search. Press ESC to cancel. Skip to content Home Engineering What is the relationship between internal and external validity? Ben Davis January 10, What is the relationship between internal and external validity? What are some threats to external validity? How do you know if a study has external validity? What are the elements of external validity? Does sample size affect external validity? Does random sampling increase external validity? Research example The management of company X wants to know if flexible working hours will improve job satisfaction among employees.

They set up an experiment with two groups: 1 control group of employees with fixed working hours 2 experiment group with employees with flexible working hours. The experiment will run for six months. All employees fill in a survey measuring their job satisfaction before the experiment pre-test and after the experiment post-test. What is your plagiarism score? Compare your paper with over 60 billion web pages and 30 million publications. What is the difference between internal and external validity? What are threats to internal validity? What are the two types of external validity? What are threats to external validity? What is experimental design? To design a controlled experiment, you need: A testable hypothesis At least one independent variable that can be precisely manipulated At least one dependent variable that can be precisely measured When designing the experiment, you decide: How you will manipulate the variable s How you will control for any potential confounding variables How many subjects or samples will be included in the study How subjects will be assigned to treatment levels Experimental design is essential to the internal and external validity of your experiment.

Is this article helpful? Raimo Streefkerk Raimo is an expert in explaining plagiarism and citing sources. He has been writing helpful articles since and is continuously improving Scribbr's Citation Generators. Other students also liked. Understanding internal validity Internal validity describes the extent to which a cause-and-effect relationship established in a study cannot be explained by other factors. Understanding external validity External validity is the extent to which you can generalize the findings of a study to other situations, people, settings and measures. An introduction to sampling methods To draw valid conclusions, you must carefully choose a sampling method. Sampling allows you to make inferences about a larger population.

During the six-month experiment, employees become more experienced and better at their jobs. Therefore, job satisfaction may improve.

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