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Data Analysis

Domain Knowledge (Data Science)

What is Domain Knowledge (Data Science)? In data science, the term domain knowledge is used to refer to the general background knowledge of the field or environment to which the methods of data science are being applied. Data science, as a discipline, can be thought of as the study of tools used to model data,...

How to Make a PowerPoint Presentation?

How to Make a PowerPoint Presentation? A PowerPoint presentation is a very powerful tool to convey information to an audience. It is often used in lectures and business meetings as it provides visualized messages. Here are the basic steps for beginners to create a PowerPoint presentation from scratch.     Create a Presentation When opening...

Top 10 Power BI Features

Top 10 Power BI Features At the 2021 Microsoft Business Application Summit, Microsoft revealed that Power BI is now used by 97% of Fortune 500 companies. With so many users now on the Power BI platform, a question that often gets brought up is, “What are the top Power BI features I need to know...

Incidence Rate

What is Incidence Rate? The incidence rate or incidence measures the frequency of a specific event over a defined period of time. In business, determining an incidence rate can be done through gathering samples, conducting surveys, and testing products.     Incidence is generally expressed as the number of cases per person per year of...

Chebyshev’s Inequality

What is Chebyshev’s Inequality? Chebyshev’s inequality is a probability theory that guarantees that within a specified range or distance from the mean, for a large range of probability distributions, no more than a specific fraction of values will be present. In other words, only a definite fraction of values will be found within a specific...

Sample Statistic

What is a Sample Statistic? A sample statistic is a figure that is computed from a sample of data. A sample is a piece or set of objects taken from a statistical population. In other words, a sample statistic is just a calculation taken from a sample that is just a piece of a population....

Creating a Date Dimension Table

What is a Date Dimension Table? A date dimension is an essential table in a data model that allows us to analyze performance more effectively across different time periods. It should be included in every dimensional model that contains a date or requires date intelligence as part of the analysis.     A date dimension...

OLTP

What is OLTP? OLTP or online transactional processing is a software program or operating system that supports transaction-oriented applications in a three-tier architecture. It facilitates and supports the execution of a large number of real-time transactions in a database. OLTP monitors daily transactions and is typically done over an internet-based multi-access environment. It handles query...

Data Integrity

What is Data Integrity? Data integrity is a process or a set of practices that ensures the security, accuracy, and overall quality of data. It is a broad concept that includes cybersecurity, physical safety, and database management. The following diagram summarizes the main components of data integrity:     Physical Safety Physical safety ensures that...

SQL Data Types

What are SQL Data Types? The Structured Query Language (SQL) comprises several different data types that allow it to store different types of information in a database. SQL data types assist in the data validation process and are essential to the mechanics of the database engine. SQL comes in different dialects, and each dialect shares...