Once you get started with human behavior research you soon find yourself running into the question whether your research project is qualitative or quantitative in nature.
Many times beginners undertaking a research project are not really aware of the inherent differences between qualitative and quantitative research methods as their objectives and applications overlap in many ways – the two terms are often used interchangeably, although they mean different things.
The core difference
In a nutshell, qualitative research generates “textual data” (non-numerical). Quantitative research, on the contrary, produces “numerical data” or information that can be converted into numbers.
What is qualitative research
Qualitative research is considered to be particularly suitable for exploratory research (during the pilot stage of a research project, for example). It is primarily used to discover and gain an in-depth understanding of individual experiences, thoughts, opinions, and trends, and to dig deeper into the problem at hand.
The data collection toolkit of a qualitative researcher is quite versatile, ranging from completely unstructured to semi-structured techniques. The most commonly applied qualitative methods include individual interviews, group discussions (focus groups), and behavioral observations.
In addition, eye tracking or automatic facial expressions can be collected and analyzed qualitatively, for example in usability research, where gaze patterns or expressions of frustration / confusion can be used to track the journey of an individual respondent within a software interface.
Typically, qualitative research focuses on individual cases and their subjective impressions. This requires an iterative study design – data collection and research questions are adjusted according to what is learned (follow this link to get more details).
Often, qualitative projects are done with few respondents and are supposed to provide insights into the setting of a problem, serving as a source of inspiration to generate hypotheses for subsequent quantitative projects.
What is quantitative research?
Simply put, quantitative research is all about numbers and figures. It is used to quantify opinions, attitudes, behaviors, and other defined variables with the goal to confirm causal hypotheses about a specific phenomenon and generalize the results from the study sample to the general population (or specific groups).
As quantitative research explicitly specifies what is measured and how it is measured in order to uncover patterns in behavior, motivation, emotion, and cognition, quantitative data collection is often considered to be much more structured than qualitative methods.
Quantitative research techniques
Quantitative techniques typically comprise various forms of questionnaires and surveys, structured interviews as well as a behavioral observation based on explicit coding and categorization schemes.
In addition to these traditional techniques, biometric recordings such as eye tracking, EEG, GSR / EDA, EMG, and ECG as well as computer-guided automatic facial expression analysis procedures are used.
All of these quantify the subconscious reactions, cognitive and affective processes in such a way that numerical results can be obtained – for example, heatmaps from eye tracking (representing the distribution of visual attention), the number of GSR peaks (indicating the amount of physiological arousal) or the power of a specific EEG band (reflecting the person’s motivation or engagement with a specific stimulus).
After data collection, quantitative analysis techniques and statistics are applied, ranging from parametric procedures such as t-tests and ANOVAs to non-parametric methods and bootstrapping techniques.
This requires much bigger sample sizes compared to qualitative projects but allows you to conclude not only for your particular respondent pool but instead for the larger population or specific segments of interest. At the end of a quantitatively oriented project, researchers often employ a more qualitative phase in order to explore selected findings in more detail.
Qualitative or quantitative study design?
Ultimately, whether to pursue a qualitative or a quantitative study approach is up to you – however, be sure to base your decision on the nature of your project and the kind of information you seek in the context of your study and the resources available to you.
If you would like to learn more about qualitative and quantitative research designs, contact our experts at iMotions. We’re happy to help!