Things A Data Scientist Should Know

Data science is a relatively new field, and it can be difficult to know what skills you need to get started. However, there are some essential skills that all data scientists should know. In this blog post, we will explore some of the things a data scientist should know. From statistics and programming to machine learning and data visualization, read on to learn more about the skills you need to succeed in data science.

What is data science?

Data science is a field of study that combines scientific methods, mathematics, and computer science to gain insights from data. Data scientists use their skills to solve problems in areas such as business, finance, healthcare, marketing, and more.

The term “data science” is relatively new, but the concept has been around for centuries. Scientists have been using data to make discoveries and advance their knowledge since the early days of research. In recent years, however, the availability of large datasets and advances in computing power have made data science a more prominent field of study.

Data science is interdisciplinary by nature, drawing from disciplines such as statistics, mathematics, and computer science. Data scientists use a variety of methods to clean, process, and analyze data. They also use their skills to build models that can make predictions or recommendations based on data.

Some common applications of data science include:

  • Predicting consumer behavior
  • Analyzing financial markets
  • Improving healthcare outcomes
  • Detecting fraudulent activity
  • Optimizing marketing campaigns

The different types of data

Data comes in many different forms, and each type of data has its own unique characteristics. The four main types of data are:

  • Nominal data is used to identify a particular object or member of a group. It is often represented by a name or label, and there is no inherent order to the data. For example, a list of countries would be considered nominal data.
  • Ordinal data is similar to nominal data, but there is an inherent order to the data. For example, a list of ranked items (from best to worst) would be considered ordinal data.
  • Interval data represents quantitative information that has equal intervals between values, but no true zero point. Temperature is a good example of interval data, because there is an equal interval between each degree (e.g., 10 degrees Celsius is twice as warm as 5 degrees Celsius). However, because there is no absolute zero point (i.e., you can’t have negative temperatures), interval data cannot be used for comparisons between values.
  • Ratio data represents quantitative information that has both an absolute zero point and equal intervals between values. This makes ratio data ideal for comparisons between values. Examples of ratio data include things like length, width, weight, and time.

The different types of data scientists

In the business world, data scientists come in all shapes and sizes. Depending on the company, data scientists may have different titles (e.g., Data Analyst, Business Analyst, Data Architect, etc.), but they all share a common love for data and analytics.

Here are the different types of data scientists:

  1. The Business Analyst: Business analysts are responsible for understanding the data that drives a company’s business decisions. They use their analytical skills to make recommendations that improve business outcomes.
  2.  The Data Architect: Data architects design and build the systems that house an organization’s critical data assets. They work with IT teams to ensure that data is properly stored, secured, and accessible to those who need it.
  3. The Data Engineer: Data engineers build the pipelines that move data from its raw state into the hands of data scientists and other decision-makers. They are experts in big data technologies and know how to wrangle large datasets for analysis.
  4. The Machine Learning Engineer: Machine learning engineers develop algorithms that allow computers to learn from data without being explicitly programmed. This is a relatively new field, but machine learning is becoming increasingly important as organizations look to automate more tasks.
  5. The Statistician: Statisticians use their knowledge of mathematics and statistics to analyze data and solve problems. They often work in teams with other data scientists to help interpret results and make predictions about future trends.

What skills do you need to be a data scientist?

There is no one-size-fits-all answer to this question, as the skills required to be a data scientist will vary depending on the specific role and company. However, there are some key skills that all data scientists should possess:

  • Analytical skills: Data scientists need to be able to analyse large amounts of data and identify patterns and trends.
  • Programming skills: Data scientists need to be able to write code in order to clean and manipulate data, as well as build models and algorithms.
  • Communication skills: Data scientists need to be able to effectively communicate their findings to non-technical audiences.
  • Domain knowledge: Data scientists need to have a deep understanding of the domain they are working in, whether it be healthcare, finance, retail, etc.

The different types of data analysis

There are a few different types of data analysis that are commonly used in business and research. These include:

  • Descriptive analysis: This type of analysis is used to describe the data, usually through summary statistics or visualizations.
  • Inferential analysis: This type of analysis is used to make inferences from the data, usually using statistical techniques.
  • Predictive analysis: This type of analysis is used to predict future events, usually using mathematical models.
  • Prescriptive analysis: This type of analysis is used to prescribe actions or solutions, usually using optimization techniques.

The different types of machine learning

There are three main types of machine learning: supervised, unsupervised, and reinforcement. Supervised learning is where the data has labels and the algorithm learn from these labels. Unsupervised learning is where the data doesn’t have labels and the algorithm has to find structure in the data. Reinforcement learning is where an agent learns by taking actions and receiving rewards for these actions.

Data collection

There are many different ways to collect data, and a data scientist should be familiar with as many of them as possible. Data can be collected through surveys, interviews, focus groups, experiments, and observational studies. It is important to choose the right method for each project, as different methods will yield different kinds of data.

Surveys are a common way to collect data from a large number of people. They can be administered in person, by mail, or online. Interviews are another common method of data collection, and can be used to collect qualitative data from a smaller number of people. Focus groups are similar to interviews, but involve a group of people discussing a topic together. Experiments are used to collect quantitative data by manipulationg variables and measuring the results. Observational studies involve observing behavior without manipulating variables.

Each method of data collection has its own advantages and disadvantages, so it is important to choose the right one for each project. Surveys are good for collecting quantitative data from a large number of people, but they can be expensive and time-consuming to administer. Interviews are good for collecting qualitative data from experts on a topic, but they can be biased if the interviewer asks leading questions. Focus groups can provide valuable insights into group dynamics, but they can also be affected by groupthink. Experiments allow for precise control over variables, but they may not produce results that generalize to the real world. Observational studies allow researchers to study behavior in its natural setting, but it can be difficult to control for all the variables that might be affecting the behavior.

Data cleaning

Once data has been collected, it needs to be cleaned before it can be analyzed. Data cleaning is the process of identifying and correcting errors in the data. This can be a time-consuming process, but it is essential for ensuring that the data is accurate and ready for analysis.

There are many different ways to clean data, and a data scientist should be familiar with as many of them as possible. Data can be cleaned manually or automatically. Manual methods involve going through the data and correcting errors by hand. This can be a tedious and time-consuming process, but it is often necessary in order to ensure that the data is accurate. Automatic methods involve using software to identify and correct errors in the data. This can save time and effort, but it is important to make sure that the software is reliable before using it.

Data analysis

Once data has been collected and cleaned, it needs to be analyzed in order to extract meaning from it. Data analysis is the process of using statistical and mathematical techniques to examine data. This can involve descriptive statistics, inferential statistics, predictive modeling, machine learning

Data processing

As a data scientist, it is important to be well-versed in data processing. This includes everything from data wrangling and cleaning to more advanced techniques like feature engineering and dimensionality reduction.

Data wrangling and cleaning are essential skills for any data scientist. This involves dealing with missing values, outliers, and other issues that can impact the quality of your data. Feature engineering is another important skill, as it allows you to create new features that can be used in machine learning models. Dimensionality reduction is also useful for dealing with high-dimensional data sets.

Data analysis

As a data scientist, it is important to be able to effectively analyze data. There are a variety of techniques that can be used to analyze data, and it is important to choose the right technique for the job. Some common techniques include:

  • Descriptive statistics: This is a method of summarizing data using methods like mean, median, mode, etc.
  • Inferential statistics: This is a method of making predictions or inferences based on data.
  • Regression analysis: This is a method of finding relationships between variables in order to make predictions.
  • Time series analysis: This is a method of analyzing data over time in order to identify trends or patterns.

Data visualization

Data visualization is an important tool for data scientists. It can help them to understand data, find patterns, and make decisions. There are many different ways to visualize data, and data scientists should know how to use a variety of tools and techniques.

There are a few things that all data visualization should have:

  1. A clear purpose: Data visualization should be used to answer a question or solve a problem.
  2. Accurate and up-to-date data: Data that is outdated or inaccurate will not be helpful in decision making.
  3. Visual elements that are easy to understand: The use of colors, shapes, and labels should help the viewer to quickly understand the meaning of the visualization.
  4. A legend: A legend should be included so that the viewer knows what the different elements in the visualization represent.
  5. Clear axes: The axes should be labeled so that the viewer knows what each axis represents.
  6. A title: The title should be descriptive and give the viewer an idea of what the visualization is about.

Data interpretation

In order to make conclusions and recommendations from data, a data scientist must be able to interpret the data. Data interpretation involves understanding the meaning of the data and how it can be applied.

There are a few steps that are involved in data interpretation:

  1. Understand the context in which the data was collected;
  2. Understand the variables that are being measured;
  3. Understand the relationships between the variables;
  4. Draw conclusions from the data; and
  5. Make recommendations based on those conclusions.


Data science is a relatively new field, and there is still a lot of debate about what skills a data scientist should have. However, there are some skills that are universally agreed upon as being essential for any data scientist. In this article, we’ve covered 10 things every data scientist should know, from the basics of statistics to more advanced topics like machine learning. If you’re considering a career in data science, make sure you have at least a solid foundation in all of these areas before you start your job search.