SQL is still the most commonly used query language. Many people use it for analysis tasks, such as searching for a specific user in a database, exporting rows to Excel, and grouping categories, among others. However, in data engineering, SQL is not just a tool for data analysis; it plays a key role in building […]
Multi-panel plots are a go-to tool for data analysts and scientists. Whether you’re comparing model outputs, segmenting behavioral trends, or tracking multiple time series, breaking a figure into subplots is often the fastest way to present a lot of information at once. But there’s a catch: just because something fits on a page doesn’t mean […]
The model had all the right ingredients: clean training data, carefully selected features, and performance metrics that looked solid on paper. It was designed to predict user retention, and in a controlled evaluation setting, it performed well. But in production, cracks started to appear. Power users were being misclassified as likely to churn. Casual users […]
Many people jump straight into building models, eager to extract insights or maximize accuracy. However, without a proper data pipeline to clean, structure, and process your data, your model will either fail or produce results that look good but are misleading. The Messy Truth About Real-World Data In an ideal world, data would be clean, […]
We all love a good chart, don’t we? A clean line graph or a slick pie chart can make your data look polished and professional. But here’s the thing: using the wrong chart,even if it looks nice, can totally mess up how your data is interpreted. Charts are powerful tools, but they can actually reduce […]
Confidence intervals are everywhere in statistics. They are meant to show how sure we are about a number, like an average or a proportion. But here is the catch: they do not actually tell you how confident you should be about the specific interval you have right now. That misunderstanding creates what I call The […]
Data doesn’t just magically become useful. Whether you’re building dashboards, feeding machine learning models, or just trying to get a cleaner look at last quarter’s sales, you need data that’s structured, clean, and actually means something. And that’s where transformation comes in, particularly through ETL (Extract, Transform, Load) and ELT (Extract, Load, Transform) processes. But […]
Let’s be honest. Few things are more misleading in machine learning than a model showing 99% (or even 100%) accuracy because of overfitting. On paper, that number looks great. But just like a first date that feels a little too perfect, something usually feels off. And most of the time, it is. That shiny accuracy […]
Let’s talk about data. It’s everywhere right now, right? The term has become synonymous with the tech boom of the 2020s. But here’s the catch, data isn’t something we just discovered. It’s always been essential. The real shift? How accessible it has become today, thanks to the massive strides in AI and machine learning. Before […]
“Numbers don’t lie, but they sure can mislead.” You’ve probably heard this before, and in the world of statistics, it couldn’t be more accurate. People often hail averages as the go-to statistic for summarizing data, but here’s the catch: if you rely on averages without digging deeper, you might miss the true story or, worse, […]