The Fundamentals of Data Science

*Guest blog post by Mic Farris. Mic is a Decision Science & Analytics Leader at CenturyLink.*

Two of the biggest buzzwords in our industry are “big data” and “data science”. Big Data seems to have a lot of interest right now, but Data Science is fast becoming a very hot topic.

*Source for picture: click here*

I think there’s room to really define the **science** of data science – what are those fundamentals that are needed to make data science *truly *a science we can build upon?

What follows are such a set of fundamentals:

**Fundamentals of Data Science**

**Introduction**

The easiest thing for people within the big data / analytics / data science disciplines is to say “I do data science”. However, when it comes to data science fundamentals, we need to ask the following critical questions: What really is “data”, what are we trying to do with data, and how do we apply scientific principles to achieve our goals with data?

- What is Data?
- The Goal of Data Science
- The Scientific Method

**Probability and Statistics**

The world is a probabilistic one, so we work with data that is probabilistic – meaning that, given a certain set of preconditions, data will appear to you in a specific way *only part of the time*. To apply data science properly, one *must *become familiar and comfortable with probability and statistics.

- The Two Characteristics of Data
- Examples of Statistical Data
- Introduction to Probability
- Probability Distributions
- Connection with Statistical Distributions
- Statistical Properties (Mean, Mode, Median, Moments, Standard Deviation, etc.)
- Common Probability Distributions (Discrete, Binomial, Normal)
- Other Probability Distributions (Chi-Square, Poisson)
- Joint and Conditional Probabilities
- Bayes’ Rules
- Bayesian Inference

**Decision Theory**

This section is one of the key fundamentals of data science. Whether applied in scientific, engineering, or business fields, we are trying to make decisions using data. Data itself isn’t useful unless it’s telling us something, which means **we’re making a decision about what it is telling us**. How do we come up with those decisions? What are the factors that go into this decision making process? What is the best method for making decisions with data? This section tell us…

- Hypothesis Testing
- Binary Hypothesis Test
- Likelihood Ratio and Log Likelihood Ratio
- Bayes Risk
- Neyman-Pearson Criterion
- Receiver Operating Characteristic (ROC) Curve
- M-ary Hypothesis Test
- Optimal Decision Making

**Estimation Theory**

Sometimes we make characterizations of data – averages, parameter estimates, etc. Estimation from data is essentially an extension of decision making, a natural next section from Decision Theory.

- Estimation as Extension of M-ary Hypothesis Test
- Unbiased Estimation
- Minimum Mean Square Error (MMSE)
- Maximum Likelihood Estimation (MLE)
- Maximum A Posteriori Estimation (MAP)
- Kalman Filter

**Coordinate Systems**

To bring various data elements together into a common decision making framework, we need to know how to align the data. Knowledge of coordinate systems and how they are used becomes important to lay a solid foundation for bringing disparate data together.

- Introduction to Coordinate Systems
- Euclidian Spaces
- Orthogonal Coordinate Systems
- Properties of Orthogonal Coordinate Systems (angle, dot product, coordinate transformations, etc.)
- Cartesian Coordinate System
- Polar Coordinate System
- Cylindrical Coordinate System
- Spherical Coordinate System
- Transformations Between Coordinate Systems

**Linear Transformations**

Once we understand coordinate systems, we can learn why to transform the data to get at the underlying information. This section describe how we can transform our data into other useful data products through various types of transformations, including the popular Fourier transform.

- Introduction to Linear Transformations
- Properties of Linear Transformations
- Matrix Multiplication
- Fourier Transform
- Properties of Fourier Transforms (time-frequency relationship, shift invariance, spectral properties, Parseval’s Theorem, Convolution Theorem, etc.)
- Discrete and Continuous Fourier Transforms
- Uncertainty Principle and Aliasing
- Wavelet and Other Transforms

**Effects of Computation on Data**

An often overlooked aspect of data science is the impact the algorithms we apply have on the information we are seeking to find. Merely applying algorithms and computations to create analytics and other data products has an impact on the effectiveness data-driven decision making ability. This section take us on a journey of advanced aspects of data science.

- Mathematical Representation of Computation
- Reversible Computations (Bijective Mapping)
- Irreversible Computations
- Impulse Response Functions
- Transformation of Probability Distributions (due to addition, subtraction, multiplication, division, arbitrary computations, etc.)
- mpacts on Decision Making

**Prototype Coding / Programming**

One of the key elements to data science is the willingness of practitioners to “get their hands dirty” with data. This means being able to write programs that access, process, and visualize data in important languages in science and industry. This section takes us on a tour of these important elements.

- Introduction to Programming
- Data Types, Variables, and Functions
- Data Structures (Arrays, etc.)
- Loops, Comparisons, If-Then-Else
- Functions
- Scripting Languages vs. Compilable Langugages
- SQL
- SAS
- R
- Python
- C++

**Graph Theory**

Graphs are ways to illustrate connections between different data elements, and they are important in today’s interconnected world.

- Introduction to Graph Theory
- Undirected Graphs
- Directed Graphs
- Various Graph Data Structures
- Route and Network Problems

**Algorithms**

Key to data science is understanding the use of algorithms to compute important data-derived metrics. Popular data manipulation algorithms are included in this section.

- Introduction to Algorithms
- Recursive Algorithms
- Serial, Parallel, and Distributed Algorithms
- Exhaustive Search
- Divide-and-Conquer (Binary Search)
- Gradient Search
- Sorting Algorithms
- Linear Programming
- Greedy Algorithms
- Heuristic Algorithms
- Randomized Algorithms
- Shortest Path Algorithms for Graphs

**Machine Learning**

No data science fundamentals course would be complete without exposure to machine learning. However, it’s important to know that these techniques build upon the fundamentals described in previous sections. This section gives practitioners an understanding of useful and popular machine learning techniques and why they are applied.

- Introduction to Machine Learning
- Linear Classifiers (Logistic Regression, Naive Bayes Classifier, Support Vector Machines)
- Decision Trees (Random Forests)
- Bayesian Networks
- Hidden Markov Models
- Expectation-Maximization
- Artificial Neural Networks and Deep Learning
- Vector Quantization
- K-Means ClusteringComment

*Originally posted here. *

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