# Foundations of Data Science and Analytics

**- Overview**

Data science and data analytics are both fields that involve working with data to gain insights. Data science is an umbrella term for all aspects of data processing, including collection, modeling, and insights. Data analytics is a subset of data science that focuses on statistics, mathematics, and statistical analysis.

Data science and data analytics can be considered different sides of the same coin, and their functions are highly interconnected. Here are some differences between data science and data analytics:

- Data science: Involves building, cleaning, and organizing datasets. Data scientists use data to understand the future, model data to make predictions, identify opportunities, and support strategy. Data science often involves using data to build models that can predict future outcomes.
- Data analytics: Involves understanding datasets and gleaning insights that can be turned into actions. Data analysts work with the data as a snapshot of what exists now, solving problems and spotting trends. Data analytics tends to focus more on analyzing past data to inform decisions in the present. Business users perform data analytics within business intelligence (BI) platforms for insight into current market conditions or probable decision-making outcomes.

Please refer to the following for more information:

- Wikipedia:
**Data Science**

### - The Mathematical Foundations of Data Science

The mathematical foundations of data science include topics such as: linear algebra, calculus, statistics, probability, optimization, number theory, numerical linear algebra, scientific computing.

Data scientists use these mathematical foundations to analyze large amounts of data and extract meaningful insights for business.

Linear algebra is an essential part of coding and thus of data science and machine learning (ML). Calculus is key to understanding the linear algebra and statistics needed in ML and data science.

Data science is a multidisciplinary approach that combines principles and practices from the fields of mathematics, statistics, artificial intelligence (AI), and computer engineering.

According to UC Berkeley, the foundations of data science combines three perspectives: inferential thinking, computational thinking, and real-world relevance.

The four pillars of data science are: domain knowledge, math and statistics skills, computer science, and communication and visualization.

Mathematics is a core educational pillar for data scientists. It's crucial for statistical analysis, mathematical modeling, ML, and data visualization.

Here are some roles of mathematics and key foundations in data science:

- Make sense of data: Mathematics helps uncover patterns, identify relationships, and draw conclusions from data. It also plays an important role in developing algorithms for ML and AI.
- Solve problems: Mathematics can help you solve problems, optimize model performance, and interpret complex data that answer business questions.
- Build accurate models: A strong foundation in mathematics is essential to building accurate models, making informed decisions, and communicating insights to non-technical stakeholders.
- Communicate complex ideas: Understanding the mathematical principles underlying data science and AI enables us to make better decisions, optimize processes, and effectively communicate complex ideas.

**- Characteristics of Data Science**

Here are some characteristics of data science:

- Data analysis: A core skill that involves analyzing data to gain insights and make better decisions.
- Data visualization: A key stage in the data science process that provides a first glance at data in a graphical style.
- Exploratory data analysis: An essential aspect of data science that allows you to understand data sets, develop hypotheses, and uncover hidden patterns.
- Data exploration: An important and time-consuming step in the data science life cycle that involves extracting patterns from data to solve problems.
- Classification: A fundamental concept in data science that involves using machine learning to predict class labels for data inputs.
- Cluster analysis: A staple of unsupervised machine learning and data science that automatically finds patterns in data without the need for labels.

**- The Phases of the Data Science Lifecycle**

As the name suggests, data science is a field of study that investigates large volumes of information using modern tools and techniques to discover unseen patterns, derive meaningful information, and make business decisions based on that information.

Predictive models are built using sophisticated machine learning (ML) algorithms in data science. Data for analysis can come from many different sources and be presented in a variety of formats.

Data science is a related field of big data that aims to analyze large volumes of complex raw data and provide businesses with meaningful information based on this data. It is the combination of many fields including statistics, mathematics and computing to interpret and present data for effective decision-making by business leaders.

The data science lifecycle consists of five distinct phases, each with its own tasks:

- Capture: data acquisition, data entry, signal reception, data extraction. This phase involves collecting raw structured and unstructured data.
- Maintenance: data warehouse, data cleansing, data staging, data processing, data architecture. This phase involves taking raw data and putting it into a usable form.
- Process: data mining, clustering/classification, data modeling, data aggregation. Data scientists take prepared data and examine it for patterns, range, and bias to determine its usefulness in predictive analytics.
- Analytics: Exploratory/confirmative, predictive analytics, regression, text mining, qualitative analysis. This is the real content of the life cycle. This phase involves performing various analyzes on the data.
- Communications: data reporting, data visualization, business intelligence, decision making. In this final step, the analyst prepares the analysis in an easy-to-read format such as charts, graphs, and reports.

**- The Data Science Process**

Data science is about the systematic processes data scientists use to analyze, visualize, and model large amounts of data.

The data science process helps data scientists use these tools to discover unseen patterns, extract data, and transform information into actionable insights that are meaningful to the company. This helps companies and businesses make decisions that contribute to customer retention and profits.

Furthermore, the data science process helps to discover hidden patterns in both structured and unstructured raw data. This process helps turn problems into solutions by viewing business problems as projects.

So let us understand in detail what is the data science process and the steps involved in the data science process. The six steps of the data science process are as follows:

- Defining the problem
- Gather the raw data needed for the problem
- Process data for analysis
- Explore data
- Do an in-depth analysis
- Exchange Analysis Results

Since the data science process stages help in turning raw data into monetary gains and overall profits, any data scientist should have a good understanding of the process and its importance.

**- The Life Cycle of Data Analytics**

Data analytics (DA) is a process that involves inspecting data to draw conclusions and improve software systems. The DA life cycle has six phases:

- Data discovery and formation
- Data preparation and processing
- Design a model
- Model building
- Result communication and publication
- Measuring of effectiveness

The data analytics life cycle also has other life stages, including creation, testing, consumption, and reuse. Each stage has its own characteristics and significance.

Here are some steps in the DA life cycle:

- Data exploration: An important first step where an analyst tries to understand an unfamiliar dataset.
- Data extraction: An essential step for many DA processes, where the necessary data is extracted from any data sources.
- Data modeling: A fundamental component of analytics that helps organizations collect and manage accurate data sources.
- Model evaluation: Involves evaluating the performance of the predictive model to ensure that it is accurate and reliable.
- Model deployment: The fourth stage in the model development life cycle, but is usually the most cumbersome for data scientists as it takes time and resources.

### - Data Augmentation and Feature Engineering

Data augmentation and feature engineering are techniques that can improve deep learning models. Data augmentation involves creating new data samples from existing data by applying random transformations. Feature engineering involves extracting, creating, or selecting relevant features from raw data.

Data augmentation can help: Increase the size and diversity of training data, Reduce overfitting, Enhance model robustness to different inputs, Improve model accuracy, and Reduce the cost of labeling and cleaning the raw dataset.

Some data augmentation techniques include:

- Noise injection
- Shifting
- Changing the speed
- Changing the pitch
- Word or sentence shuffling
- Word replacement
- Syntax-tree manipulation

Some challenges of data augmentation include:

- Finding an optimal augmentation strategy for the data is non-trivial
- The inherent bias of original data persists in augmented data

**[More to come ...]**