So what do we mean when we say that a measurement procedure is constant or stable? This is the case whether you are an undergraduate or master’s level student doing a dissertation, a doctoral student, or a seasoned academic researcher. Since there are many ways of thinking about intelligence e. Reaction time by measuring the speed of pressing a button when a light bulb goes on i. Take the following example:. Since any of these 14 threats could have affected the internal validity of the main journal article, you should briefly read up about each one, and then assess whether you think these threats were present in the main journal article.
In this article, we: This is the case whether you are an undergraduate or master? This assumption, that the variable you are measuring is stable or constant, is central to the concept of reliability. For example, we may choose to use questionnaire items, interview questions, and so forth. When we think about the reliability of these variables, we want to know how stable or constant they are. Reducing such limitations involves a understanding the types of research limitation you may face when doing a dissertation, b anticipating what these will be in your dissertation, and c avoiding them becoming a reality where possible.
For example, in lard article, Internal validitywe discuss 14 potential threats to internal validity, which include a history effects, b maturation, c testing effects, d instrumentation, e statistical regression, f selection biases, g experimental mortality, h causal time order, i diffusion or imitation of treatments, j compensation, k compensatory rivalry, l demoralization, m experimenter effects and n subject effects.
However, it is worth mentioning that:. So what do we mean when we say that a measurement procedure is constant or stable? Dissertatiln all, in STEP TWO below, you will need to assess the research quality of the main journal article, before being able to consider the potential weaknesses in research quality in your dissertation, and how you will overcome these weaknesses.
Caused by factors including current mood, level of fatigue, general health, luck in guessing answers to questions you don’t know. You can learn more about construct validity in the article: However, we reliabilihy to introduce guides to assess research quality in qualitative research designs in the not too distant future. The trick is to a understand the types of research limitation you may face when doing a dissertation, b anticipate what these will be in your dissertation, and c avoid them becoming a reality where possible.
You can learn more about these types of reliability in the article: Would expect measurements of IQ to be a few points up and down of your actual IQ, not to points, for example i.
In this article, we: So what do we mean when we say that a measurement procedure is reliaility or stable? This assumption, that the variable you are measuring is stable or constant, is central to the concept of reliability. To do this, you first need to understand these five main factors through which research quality is assessed. Reliability, like validityis a way of assessing the quality of the measurement procedure used to collect data in a dissertation.
However, we plan to introduce guides reliabiligy assess research quality in qualitative research designs in the not too distant future. All research has limitationswhich negatively impact upon the quality of the findings you arrive at from your data analysis. These questionnaire items or interview questions are part of the dissertatino procedure.
Reliability in research | Lærd Dissertation
Internal validity External validity Extraneous and confounding reliabiliry Construct validity: You should note that it will not always be possible to tell whether such a threat was a problem because whilst some are more evident e. Actual level of intelligence Error: By comparison, where the error reliagility within a measurement procedure is relatively largethe scores that are obtained over a number of measurements will be relatively inconsistent ; that is, there will be large differences in laedr scores between measurements.
The main journal article you are interested in will also have a number of limitations, some of which will have inevitably become the justifications for your chosen routeand the approach you selected within that route. In quantitative dissertations, research quality is assessed based on the internal validityexternal validityconstruct validityreliability and objectivity of the research.
You need to think about research quality at this stage in the dissertation process because many of the problems experienced dkssertation the dissertation process can be avoided. If you would like to know when these guides become available, please leave feedback.
It is assumed that this happens randomly, with the error averaging zero over time; that is, the increases or decreases in error over a number of measurements even themselves out so that we end up with the true score e. You can critically analyse the research strategy used by assessing the research quality of the dissertaton strategy used in the main journal article in terms of a the internal and external validity of the research strategy, and b the construct validity and reliability of the measurement procedure that was used i.
To improve the research quality of dissertatlon dissertation, you need to follow four steps: Actual reaction speed of person Error: The true score is the actual score that would reliably reflect the measurement e. When the amount of error is lowthe reliability of the measurement is high. In addition, since many undergraduate and even master?
Even if limitations in the research strategy do not act as the main justification for your choice of routeor the approach within that route i. You can learn more about reliabilityerror and reaction times by reading YellottRatcliffand Salthouse and Hedden When reading up about sissertation validity and reliability in these articles, you will learn how to assess a piece of research i.