Research methods theory is a useful place to look for justifications for method-driven extensions because such theory typically explains the advantages and disadvantages of using particular research methods, as well as the relative advantages and disadvantages of using one research method e. Dichotomous variables are nominal variables that have just two categories. FOURTH Decide whether the dependent variable or group s should be included first, last or in two parts Sometimes it makes more sense for the dependent variable to appear before the group s you are interested in, but sometimes it is the opposite way around. In the section that follows, the structure of comparative research questions is discussed. These dichotomous variables could address questions like:. To understand more about history effects , consider their following characteristics:

Second, we explain what dependent and independent variables are. However, Crosby et al. Building the theoretical case , these may also become more apparent in the next stage i. Therefore, the aim of the tutor’s investigation is to examine whether these independent variables i. Ideally, you will have included these categories or levels based on some primary or secondary research.

However, there can also be some ambiguities when deciding whether a variable is categorical or continuous.

Concepts, constructs and variables | Lærd Dissertation

Ratio variables Ratio variables are interval variables that meet an additional condition: In order to establish an operational definition of a construct, you also need to know about different types of variables [see the article: This type of design aims to answer questions such as: Female, British university students In terms of the first descriptive research question about daily calorific intakewe are not necessarily interested in frequenciesor using a measure of central tendency or measure of spreadbut instead want understand what percentage of American men and women exceed their daily calorific allowance.


For example, we could compare how frequently the students used Facebook each week, looking for differences between male and female students. In the sections that follow, each of these threats to internal validity are explained with accompanying examples.

laerd dissertation variables

To date, no systematic investigation has considered Experimental research designs, also known as intervention studiesprovide the greatest warrant i.

However, some constructs e. Leading with a dissertation aim or goals This study dissertation, research In such cases, it may be better to refer to the variable gender as sex. In our example of the 10, university students, if we were only interested in achieving a sample size of say students, we may simply stand at one of the main entrances to campus, where it would be easy to invite the many students that pass by to take part in the research.

Imagine that a tutor asks students to complete a maths test.

Threats to internal validity ]. GOAL C Testing for differences between groups or treatment conditions Are you trying to test for differences between groups e.

To understand more about history effectsconsider their following characteristics: Categorical and continuous variables There are two groups of variables that you need to know about: Second, we explain what dependent and independent variables are. Constructs can be represented by a wide range of variables.

To illustrate these ideas, [insert company diseertation or type] was used as a case study to show variaboes However, there are also specific goals that you may want to achieve within these research designs. In each of these cases, we have different groups that we are comparing e.


In each of these cases, we have different groups that we are comparing e. Are you male or female?

Moderator Analysis with a Dichotomous Moderator using SPSS Statistics

Instead, researchers following a qualitative research design tend to be interested in the intricacies of the sample being studied. If you are performing a piece of descriptivequantitative research for your dissertation, you are likely to need to set quite a number of descriptive research questions.

When it comes to Likert scales, as highlighted variabkes the previous example, there can be some disagreement over whether these should be considered ordinal variables or continuous variables [see the section: Categorical variables are also known as qualitative or discrete variables.

However, there are also specific goals that you may want to achieve within these research designs.

laerd dissertation variables

Let’s say that the university has roughly 10, students. Some examples of interval variables are: For example, happiness could be associated with love, financial security, cigarettes, puppies, a song, ice cream, and so on.

laerd dissertation variables

These purposive sampling techniques include maximum variation samplinghomogeneous sampling, typical case samplingextreme or deviant case samplingtotal population sampling and expert sampling.

An important aspect of such re-testing is typically the use of the same research strategy applied in the main journal article. Euthanasia “The painless killing of a patient suffering from an incurable and painful disease or in an irreversible coma” Oxford Dissettation, You need to do this for two main reasons: