Table of Contents
Introduction
In writing your thesis, one of the first terms that you encounter is the word variable. Failure to understand the meaning and the usefulness of variables in your study will prevent you from doing excellent research. What are variables, and how do you use variables in your research?
I explain this key research concept below with lots of examples of variables commonly used in a study.
You may find it challenging to understand just what variables are in research, especially those that deal with quantitative data analysis. This initial difficulty about variables becomes much more confusing when you encounter the phrases “dependent variable” and “independent variable” as you go deeper in studying this vital concept of research, as well as statistics.
Understanding what variables mean is crucial in writing your thesis proposal because you will need these in constructing your conceptual framework and in analyzing the data that you have gathered.
Therefore, it is a must that you should be able to grasp thoroughly the meaning of variables and ways on how to measure them. Yes, the variables should be measurable so that you will use your data for statistical analysis.
I will strengthen your understanding by providing examples of phenomena and their corresponding variables below.
Definition of Variable
Variables are those simplified portions of the complex phenomena that you intend to study. The word variable is derived from the root word “vary,” meaning, changing in amount, volume, number, form, nature, or type. These variables should be measurable, i.e., they can be counted or subjected to a scale.
The next section provides examples of variables related to climate change, academic performance, crime, fish kill, crop growth, and how content goes viral. Note that the variables in these phenomena can be measured, except the last one, where a bit more work is required.
Examples of Variables in Research: 6 Phenomena
The following are examples of phenomena from a global to a local perspective. The corresponding list of variables is given to illustrate how complex phenomena can be broken down into manageable pieces for better understanding and to subject the phenomena to research.
Phenomenon 1: Climate change
Examples of variables related to climate change:
- sea level
- temperature
- the amount of carbon emission
- the amount of rainfall
Phenomenon 2: Crime and violence in the streets
Examples of variables related to crime and violence:
- number of robberies
- number of attempted murders
- number of prisoners
- number of crime victims
- number of laws enforcers
- number of convictions
- number of carnapping incidents
Phenomenon 3: Poor performance of students in college entrance exams
Examples of variables related to poor academic performance:
- entrance exam score
- number of hours devoted to studying
- student-teacher ratio
- number of students in the class
- educational attainment of teachers
- teaching style
- the distance of school from home
- number of hours devoted by parents in providing tutorial support
Phenomenon 4: Fish kill
Examples of variables related to fish kill:
- dissolved oxygen
- water salinity
- temperature
- age of fish
- presence or absence of parasites
- presence or absence of heavy metal
- stocking density
Phenomenon 5: Poor crop growth
Examples of variables related to poor crop growth:
- the amount of nitrogen in the soil
- the amount of phosphorous in the soil
- the amount of potassium in the ground
- the amount of rainfall
- frequency of weeding
- type of soil
- temperature
Phenomenon 6: How Content Goes Viral
- positive,
- interesting,
- prominent,
- useful,
- surprising, and
- causing physiological arousal.
Notice in the above variable examples that all the factors listed under the phenomena can be counted or measured using an ordinal, ratio, or interval scale, except for the last one. The factors that influence how content goes viral are essentially subjective.
But researchers devised ways to measure those variables by grouping the respondents’ answers on whether content is positive, interesting, prominent, among others (see the full description here).
Thus, the variables in the last phenomenon represent the nominal scale of measuring variables.
The expected values derived from these variables will be in terms of numbers, amount, category, or type. Quantified variables allow statistical analysis. Variable descriptions, correlations, or differences are then determined.
Difference Between Independent and Dependent Variables
Which of the above examples of variables are the independent and the dependent variables?
Independent Variables
The independent variables are those variables that may influence or affect the other variable, i.e., the dependent variable.
For example, in the second phenomenon, i.e., crime and violence in the streets, the independent variables are the number of law enforcers. If there are more law enforcers, it is expected that it will reduce the following:
- number of robberies,
- number of attempted murders,
- number of prisoners,
- number of crime victims, and
- the number of carnapping incidents.
The five variables listed under crime and violence in the streets as the theme of a study are all dependent variables.
Dependent Variables
The dependent variable, as previously mentioned, is the variable affected or influenced by the independent variable.
For example, in the first phenomenon on climate change, temperature as the independent variable influences sea level rise, the dependent variable. Increased temperature will cause the expansion of water in the sea. Thus, sea-level rise on a global scale will occur.
I will leave the classification of the other variables to you. Find out whether those are independent or dependent variables. Note, however, that some variables can be both independent or dependent variables, as the context of the study dictates.
Finding the relationship between variables
How will you know that one variable may cause the other to behave in a certain way?
Finding the relationship between variables requires a thorough review of the literature. Through a review of the relevant and reliable literature, you will find out which variables influence the other variable. You do not just guess relationships between variables. The entire process is the essence of research.
At this point, I believe that the concept of the variable is now clear to you. Share this information with your peers, who may have difficulty in understanding what the variables are in research.
How can I write my concept on this topic ” Influence of Culture on functionality of rural water supply”
Your tutorial is candid and very easy to digest. I have enjoyed the piece. It has enhanced my perspective of variables.
Thank you very much.
Wwoow…. Thanks a lot you have simplified my understanding of variables in research.
Big applause
Thanks so much sir,I have really learned a lot about literature review. But I still have a problem identifying my variables,my topic is;The constraints to social civic engagement in Communities in my country. Please give me an idea on what my variables would be.thannks
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Hi, pls how do I write hypothesis for this topic I found on your site ‘poor performance of students in college entrance examinations
hi simplyEducate.Me
thank so much for this article you’ve been really helpful.
I need help with this research topic ‘Media production and production in America’ I’m finding it difficult in identifying the concept, construct and also I’m trying to develop three research questions and also find the three null hypothesis related to the topic. I would really appreciate if you throw more light on this. thank you.
My topic is the importance of learning other language towards inbound and outbound tourist.
How do i identify the variables?
thank you for being generous those two words have been confusing me in research now i am a better person.
Hi po Sir Patrick. Sir ‘di ba po kailangan ng questionnaire ang dalawang variable?
thank you so much
Dear Regoniel, Patrick A.
I have a question, suppose I have a variable “Gender Diversity”. In my survey questionnaire I have three questions about it. So, when I want to check the relationship between “gender diversity” and “performance of the firm”, what shall I do to make a scale on SPSS? Like three questions make one variable but when checking this variable, which question shall I consider out of three or shall I combine all three questions and divide it by the number of questions to make representative variable?
Note: I am using LIKERT Scale for this survey.
I would highly appreciate if you can help me with clearing the confusion. I have tried several books but did not find any specific way to check how the variable should be considered.
Looking forward to hear from you.
Regards,
Dear Nasreen, my apology for the late reply. You need to define “gender diversity” and “performance of the firm” as variables of the study so I will be able to give advice.
Hello sir…
Please help me to make an example of quantitative research title with 3 dependent variables…thank you
My research is correlational, and I have three variables. I’m confused with my IV an DVs. My variables are: Religiosity, Subjective-Well Being and Depression. So, is Religiosity my IV and the rest are DV?
Dear Ela, it’s a relief to read feedback from you. I just need that encouragement to go on and help students out there who want to use research as a tool to advance themselves. As the name of this website says, my write up is designed to simplify concepts into easy to understand chunks of information. I’m glad that somehow the articles helped foster understanding. Thank you…
I read most of your works sir and I must Thank you for making things easier to me. I appreciate it more cause I can now understand such things easily, well compared to my paraphernalia. The page name says it all. Simple educate me. Thank you Sir! 🙂
ps, from Philippines here! 🙂
thank much now am familiar wit variable
My Proposal ahs been Accepted. ITs about Mentoign and coaching to reduce drop of learners in Workplac based learnerships in the hospitality Sector. I need guidance on Variables and like framework.
I was in little confusion about difference among variables. Now my concept is clear! Thanks a lot Sir!
am writing a proposal for the factors that influence adoption of improved agricultural practices on cocoa production
what will be my conceptual framework