Internal validity is something that can affect dissertations that are guided by a quantitative , qualitative or mixed methods research design [see the section of Research Designs if you are unsure which research design your dissertation follows]. Where does one construct start and the other end? In this article, we explain what content validity is, providing some examples. To have confidence that this was the case, we would need to ensure that our sample closely mirrored the population that was being studied; that is, confidence that our sample shared similar characteristics to the population, such as the ratio of males to females, the age of students, the subjects that they studied, and so forth. Take the following example: Internal validity As a concept, internal validity is important because we want to be able to say that the conclusions we made in our dissertation accurately reflect what we were studying.
During this same period, the treatment group were given the same two 1-hour lectures each week, but also attended one 1-hour seminar. In this article, we a explain what face validity is, b present examples of face validity, and c discuss the advantages and disadvantages of using face validity in dissertations. To create a shorter version of a well-established measurement procedure You want to create a shorter version of an existing measurement procedure, which is unlikely to be achieved through simply removing one or two measures within the measurement procedure e. It’s not too difficult to imagine measures that could be used for emotional intelligence e. After all, it appears to make sense that the best players would have played the most games in the top team for a club. Examples of face validity Before we discuss some of the advantages and disadvantages of using face validity in your research, we have provided a few more examples to highlight how face validity can be used, and some of the associated problems. The new measurement procedure may only need to be modified or it may need to be completely altered.
Reliability in research | Lærd Dissertation
When we focus in on one of these perspectives of poverty, we may choose to create a measurement procedure to examine the construct, economic poverty. Threats to internal validity Dissertations can suffer from a wide range of dlssertation threats to internal validitywhich have been discussed extensively in the literature e.
In this section, 14 of the main threats to internal validity that you may face in your research are discussed with associated examples. You cannot say that a measurement procedure has permanently or falidity established construct validity.
To affect the outcome of an experiment in a way that threatens its internal validity, a history effect must a change the scores on the independent and dependent variables, and b change the scores of one group more than another e. This reflects the desire to assess the divergent validity of the measurement procedure [see the article: When assessing the construct validity of these two measurement procedures to measure the construct, post-natal depressionwe would want to know:.
Irrespective of the route that you are valkdity, the person marking your work will expect that you have critically analysed the research strategy used in the main journal article. Galidity all, when assessing the construct validity of a measurement procedure, we should not only check that the contents i. When assessing the construct validity of these two measurement procedures to measure the construct, post-natal depressionwe would want to laerv It is important to recognise that we are making generalisations from the observed i.
However, concepts can be studied using a wide range of constructs, and these constructs, in turn, can be explained using a number of operational definitions. Content validity Content validity is the extent to which the elements within a measurement procedure are relevant and representative of the construct that they will be used to measure Haynes et al.
The potential for a construct to be confounded There is a lot of ambiguity not only in the way that constructs can be operationally defined, but also how different constructs relate to one another e. For example, if an experimental study found that students that turn up to seminars in addition to lectures get better marks than those student that only turn up to lectures, we may argue that seminar attendance i. Threats to construct validity.
vslidity Construct validity Construct validity can be viewed as an overarching term to assess the validity of the measurement procedure e. Imagine also that a number of studies have shown that another construct, financial stressis strongly related to post-natal depression ; that is, as financial stress increases, post-natal depression increases by a certain amount.
Threats to internal validity ]. We want to know if our findings from the sample can be generalised to the population.
Construct validity and reliability are two different ways of assessing the measurement procedure used in the main journal article. This idea that X causes Y is important because internal validity is about being able to justify that X actually caused Y.
Content validity | Lærd Dissertation
However, it is often far more challenging to create reliable operational validtiy for more complex constructs like anger, depression, motivation, and task performance [see the section on Concepts, constructs and variables ]. STEP ONE Understand the five factors through which research quality is assessed In quantitative dissertations, research quality is assessed based on the internal validityexternal validityconstruct validityreliability and objectivity of the research.
The relative complexity of these types of construct reflects a number of factors: Our study is externally valid if we can be confident that the conclusions we made laerr.
This reflects the validiity to assess the predictive validity of the measurement procedure [see the article: We explain this distinction, as well as the relationship between construct validity and other forms of validity, in the first section of this article: If both measurement procedures were new i.
In this sense, construct validity is a process that you work through, involving a number of procedures i. Dissertations can suffer from a wide range of potential threats to internal validitywhich have been discussed extensively in the literature e. However, one of the more difficult assessments of dissertahion validity during a single study, which is extremely important, but less likely to be carried out, is the need to ensure that the scores that are attained from your measurement procedure for a given construct behave in a way that is consistent with that construct.
In this article, we explain what content validity is, providing some examples. Convergent and divergent validity and Criterion validity: The goal of the experiment was to compare the differences in the scores on the dependent variable i.