Qualitative vs Quantitative research: Similarities, differences, pros, and cons

What is Qualitative Research?

Qualitative research aims to use non-numerical data to understand, explore, and interpret the way people think, behaviour, and feel. This includes examining experiences, attitudes, and beliefs that exist in our subjective social reality. Qualitative research uses descriptive data to draw rich, in-depth insights into problems, topics, and phenomena. This kind of research focuses on making sense of the subjective, dynamic, and evolving nature of real life. Using this research approach, it is possible to generate new ideas for research, including hypotheses and theories that are rooted in natural settings. 

Key Features

Non-Numerical Data: Qualitative data focuses on rich, subjective sources of information including images, videos, text, and audio. This could be documents, observation notes, interview transcripts, audio recordings, video interviews, diaries, personal logs, photographs, and many more descriptive data sources. 

Inductive Reasoning: Rather than test existing theories and hypotheses, qualitative research aims to generate new ideas for research. The goal is to take a bottom-up approach and extract rich, in-depth meaning from a specific dataset. Researchers examine unique experiences and aim to draw out common themes or categories to make sense of the topic at hand. 

Flexible Research Design: Qualitative research studies have a flexible and emergent design that is data-driven. The research design, including the methods of data collection and analysis, can change throughout the study as findings emerge. This allows the design to develop alongside the study, as long as the research question is answered. 

Qualitative Researchers: Due to the subjective nature of qualitative research, the qualitative researchers are considered instruments in the process. This is because their beliefs, attitudes, personal characteristics, and experiences can influence the interpretive data collection and analysis process. 

Small Scale: Qualitative research methods can be time-consuming, and the subject matter can sometimes be very specific to a certain group of people. This means qualitative research often features a small sample of participants to be observed, interviewed, or given questionnaires. 

Open-Ended Questions: To gather the rich, in-depth data needed for qualitative research, open-ended questions are used throughout the research methods. These kinds of questions allow participants to answer how they want in detail, rather than having to select from a limited range of pre-determined answers. 

Qualitative Research Methods

For qualitative research, there are five common research methods used for data collection. Researchers often use multiple methods collect data and this depends on their chosen research approach:

Surveys can often be a time-saving, complementary method of data collection. Researchers can collect data using questionnaires with open-ended questions. These can be distributed online or in-person and allows participants to provide detailed responses in their own time. 

In-depth interviews are used to collect in-depth insights into a person’s perspective on a problem, event, or topic. Researchers ask open-ended questions in a one-to-one conversation, and can deep-dive into the participants' answers with follow-up questions. 

Focus groups are ideal for collecting data from multiple participants in the form of a group discussion. Researchers generate and facilitate discussion using open-ended questions. This research method is good for understanding complex social topics, and examining beliefs and opinions. 

Observations occur when researchers go out into natural settings of interest to create records of what they saw, heard, or encountered. This is documented in detailed field notes, and focuses on understanding how people behave. 

Secondary data involves using existing data, such as documents, photos, and videos to conduct qualitative research. This can be a more efficient way to approach a research topic, rather than collecting new data. 

Pros and Cons of Qualitative Research 

Qualitative research produces rich, in-depth insights into problems, issues, and phenomena. The research findings are often full of meaning that explore the ‘why’, ‘how’, and ‘what’ behind processes, behaviours, thoughts, feelings, attitudes, and experiences. This is something that can be hard to obtain from quantitative research. Qualitative research also focuses on real-life settings and people, which can provide a more accurate representation than laboratory based experiments. Finally, the inductive approach of qualitative research allows for new possibilities to be discovered and explored. 

However, the subjective nature of qualitative research makes it hard to replicate. Researchers are also key instruments in the process which further reduces replicability. This limits how reliable qualitative findings are, Qualitative research can also be time-consuming, especially during data analysis. Despite using a small sample, there’s often large amounts of data to prepare and analyse. These smaller samples can also make it harder for researchers to generalise their findings beyond their current participants.  

When to use Qualitative Research?

Qualitative research is ideal if you want to:

• Extract rich, in-depth, and meaningful insights into problems and topics
• Understand how people perceive their own experiences
• Explore a person’s thoughts, feelings, and behaviours
• Gain insight into social realities of specific individuals, groups, and cultures 
• Examine controversial social issues and topics 
• Generate new research ideas and possibilities 
• Learn about attitudes, beliefs, and opinions 

Qualitative Research Questions 

• Why are customers unsatisfied with their new product?
• How do teachers feel about students using artificial intelligence?
• What are teenagers' experiences of para-social relationships with influencers? 

What is Quantitative Research?

Quantitative research focuses on testing hypotheses and theories using numerical data. The aim is to use maths, statistics, and deductive logic to establish facts about behaviour or a phenomena of interest. This type of research aims to understand and measure the causal or correlational relationships between quantifiable variables. Quantitative research data can be transformed into useful graphs and tables using statistics. 

Specifically, descriptive statistics are used to summarise data, and describe the relationships or connections between variables. Inferential statistics establish the statistical significance of the given groups of data. For this reason, quantitative research requires a large sample of participants, and a carefully planned research design. This is important for conducting statistical analyses that are reliable and generalisable.  

Key Features

Here are the key features of quantitative research that contrast with the features of qualitative research: 

Numerical Data: Quantitative data focuses on variables that can be quantified, measured, and analysed through statistics. This data, which is rooted in numbers and maths, can be displayed using graphs and tables. 

Deductive Reasoning: Quantitative research aims to test whether existing theories, hypotheses, or observations can hold up in specific conditions. This allows researchers to determine whether a theory or hypotheses should be confirmed or rejected for that particular condition. 

Fixed Research Design: Quantitative research follows a structured process that is well-established. The research design, including the research questions, research methods, and data analysis techniques are often decided at the beginning and rarely changed during the study. 

Quantitative Researchers: For quantitative researchers, their approach to the world is objective, and focuses on the quantifiable, measurable aspects of reality. Their goal is to remain as objective as possible and produce results that can be generalised beyond the specific environment of the study. 

Large Scale: Statistical analyses require a large amount of data to produce significant and reliable results. For this reason, quantitative research often involves a large sample of participants. This larger sample allows results to be generalised and enables researchers to account for erroneous data. 

Close-ended Questions: Quantitative data collection methods use close-ended questions to collect quantifiable, measurable data. Close-ended questions have predetermined responses for people to pick from. This can include yes/no questions, multiple-choice answers, and rating scales of all kinds. 

Quantitative Research Methods

Experiments involve manipulating an independent variable and measuring a dependent variable. This is to examine how changes to the independent variable affect the dependent variable. Researchers can use experiments to identify cause and effect relationships between variables. 

Observations are used to watch, understand, and investigate quantifiable variables. Instead of manipulating variables, this method focuses on measuring variables. For example, weight, size, and noting the number of times something occurs are measurements. Observations are used for descriptive and correlational research designs. 

Surveys are a common and popular research method, also used for descriptive and correlational research designs. This method uses close-ended questions, such as multiple choice, or rating scales to collect data. Surveys can be used to understand how something changes over time, or to get a snapshot of the current moment. 

Pros and Cons of Quantitative Research 

Pros

Quantitative research follows structured, unambiguous, standardised processes that can be easily replicated. This improves the reliability of the study, allowing it to be replicated and proven using the same approach. Unlike qualitative research, quantitative research can be both quick and scientifically objective. Researchers can study phenomena in a timely manner, and utilise sophisticated softwares for rapid, statistical analyses. This allows researchers to process large amounts of data in an efficient way, and produce findings that are generalisable. 

Cons

If researchers are unable to obtain an adequate sample size, or end up with data that cannot be used, this limits the accuracy and generalisability of the findings. Researchers also require statistical expertise in order to conduct statistical analyses in an accurate manner. Finally, quantitative research can lack meaning and be subject to confirmation bias. That is, researchers can miss emerging phenomena because they are focused on testing a theory of hypothesis. 

When to use Quantitative Research?

Quantitative research is best used when you want to:

• Measure or quantify data 
• Establish trends and relationships between variables
• Test existing hypotheses and theories 
• Describe and predict casual relationships
• Investigate correlational relationships
• Understand the characteristics of a population or phenomena 
• Produce visual displays of information, such as graphs or tables 

Quantitative Research Questions 

• What are the demographics of my target audience on social media?
• How satisfied are customers with my products and services?
• Can mindfulness improve a student's ability to recall information?