Validity in research methodology

If more than one person is observing behavior or some event, all observers should agree on what is being recorded in order to claim that the data are reliable. However, if a test is reliable, that does not mean that it is valid. When our research is over, we would like to be able to conclude that we did a credible job of operationalizing our constructs -- we can assess the construct validity of this conclusion.

As a framework for judging the quality of evaluations it is indispensable and well worth understanding. Because the interest is in a relationship, it is considered an issue of conclusion validity.

Here are the four validity types and the question each addresses: It is where we keep our theories about how the world operates. There are two aspects of validity: The theory of validity, and the many lists of specific threats, provide a useful scheme for assessing the Validity in research methodology of research conclusions.

Assuming that there is a relationship in this study, is the relationship a causal one? Ensuring Validity Confounding Variables A confounding variable is an extraneous variable that is statistically related to or correlated with the independent variable.

It is what goes on inside our heads as researchers. We might conclude that there is a positive relationship. We might say that a measure is a valid one, or that a valid sample was drawn, or that the design had strong validity.

But each of these, the cause and the effect, has to be translated into real things, into a program or treatment and a measure or observational method. For instance, virtually all social research involves measurement or observation.

It is one thing, for instance, for you to say that you would like to measure self-esteem a construct. The figure shows the idea of cumulativeness as a staircase, along with the key question for each validity type.

In yet other terms, did we operationalize well the ideas of the cause and the effect? When we are investigating a cause-effect relationship, we have a theory implicit or otherwise of what the cause is the cause construct. Perhaps there were random irrelevancies in the study setting or random heterogeneity in the respondents that increased the variability in the data and made it harder to see the relationship of interest.

Assume that the study is completed and no significant correlation between amount of training and adoption rates is found. Validity Validity refers to the credibility or believability of the research.

Research Methodology

A research project that lacks validity may draw conclusions that are inappropriate or even dangerous if applied to the target population. Are the findings genuine?

We could, for example, conclude that there is a relationship. Relationship between reliability and validity If data are valid, they must be reliable. Failing to take a confounding variable into account can lead to a false conclusion that the dependent variables are in a causal relationship with the independent variable.

External validity involves the extent to which the conclusions can be generalized to the broader population. Different methods vary with regard to these two aspects of validity.

Module 3: Ensuring Validity

External validity - the results can be generalized beyond the immediate study.Different methods vary with regard to these two aspects of validity. Experiments, because they tend to be structured and controlled, are often high on internal validity.

In contrast, observational research may have high external validity (generalizability) because it has taken place in the real world. Relationship between reliability. A confounding variable is an extraneous variable that is statistically related to (or correlated with) the independent variable.

This means that as the independent variable changes, the confounding variable changes along with it. Failing to take a confounding variable into account can lead to a. Issues of research reliability and validity need to be addressed in methodology chapter in a concise manner.

Reliability refers to the extent to which the same answers can be obtained using the same instruments more than one time. Construct validity (CV) defines how well a test or experiment measures up to its claims.

Introduction to Validity

CV is used and particularly important in social sciences, psychology, psychometrics and language education. Validity: the best available approximation to the truth of a given proposition, inference, or conclusion.

The first thing we have to ask is: "validity of what?"When we think about validity in research, most of us think about research components.

Validity encompasses the entire experimental concept and establishes whether the results obtained meet all of the requirements of the scientific research method. For example, there must have been randomization of the sample groups and appropriate care and diligence shown in .

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Validity in research methodology
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