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Data Analysis Tutorials

Get insights on the latest tools & methods that you can use to analyze your data more effectively. Our data analysis tutorials will help you develop your skills.
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Data Science

Least Squares Method: How to Find the Best Fit Line

Use this method to make better predictions from real-world data. Learn how to minimize errors and find the most reliable trend line.

Amberle McKee

June 12, 2025

Data Science

The T-Distribution: A Key Tool for Small Sample Inference

Understand how the t-distribution helps when sample sizes are small or population variance is unknown. Compare it to the normal and Z-distributions to learn when each is appropriate.
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Vidhi Chugh

June 11, 2025

Excel

Excel Time Formulas: Calculate, Format, and Manipulate Time in Excel

Master Excel time formulas to calculate durations, handle time over 24 hours, and format time values for clear, accurate reporting.
Samuel Shaibu's photo

Samuel Shaibu

June 5, 2025

Data Science

Law of Large Numbers: A Key to Understanding Uncertainty

Understand how the law of large numbers supports statistical reasoning. See how it ensures consistency in averages over time and powers predictions in fields like sports, finance, and science.
Laiba Siddiqui's photo

Laiba Siddiqui

June 5, 2025

Data Science

Triangle Inequality: From Geometry to Machine Learning

The triangle inequality is more than just a geometric principle - it's a cornerstone of distance measures in data science. Discover how this elegant mathematical concept powers algorithms across computational geometry, optimization, and machine learning.
Vinod Chugani's photo

Vinod Chugani

May 27, 2025

Data Analysis

R-Squared Explained: How Well Does Your Regression Model Fit?

Learn what R-squared means in regression analysis, how to calculate it, and when to use it to evaluate model performance. Compare it to related metrics with examples in R and Python.
Elena Kosourova's photo

Elena Kosourova

May 14, 2025

Power BI

Mastering COUNTIF() in Power BI: A DAX-Based Approach

Power BI users from Excel always find out that Power BI does not have a native COUNTIF() function. This article will show various ways to implement COUNTIF() in Power BI and its practical use cases.
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Adejumo Ridwan Suleiman

May 6, 2025

Data Science

Time Series Decomposition: Understand Trends, Seasonality, and Noise

Learn how to break down time series data into meaningful components like trend, seasonality, and residuals using additive and multiplicative models. Learn about both classical and STL methods. Explore seasonal adjustments and practice forecasting with decomposition models.
Josef Waples's photo

Josef Waples

Laiba Siddiqui's photo

Laiba Siddiqui

April 30, 2025

Data Analysis

Hierarchical Clustering: Concept Overview With Examples

Understand the basic concepts of hierarchical clustering, how it works, and how to implement it in Python.
Austin Chia's photo

Austin Chia

April 27, 2025

Excel

Remove Blank Rows in Excel: 4 Easy Methods

Learn how to remove extra rows quickly using sorting, formulas, and VBA, depending on what works best for you.
Laiba Siddiqui's photo

Laiba Siddiqui

April 26, 2025