Hey, I'm Tomi Mester. This is my data blog, where I give you a sneak peek into online data analysts' best practices. You will find articles and videos about data analysis, AB-testing, research, data science and more…

I put together a ‘Python 3 for Data Science’ tutorial series starting from the very basics. It features 9 practical articles – that covers everything you need to know!

Scatter plots are frequently used in data science and machine learning projects. In this pandas tutorial, I’ll show you two simple methods to plot one. Both solutions will…

Plotting a histogram in Python is easier than you’d think! And in this article, I’ll show you how. I have a strong opinion about visualization in Python, which…

I always say that learning linear regression in Python is the best first step towards machine learning. Linear regression is simple and easy to understand even if you…

Pandas is one of the most popular Python libraries for Data Science and Analytics. I like to say it’s the “SQL of Python.” Why? Because pandas helps you…

Following the previous article about creating data tables in SQL, now we want to load data into our freshly created SQL table. In this article, I’ll show you…

As I have mentioned several times, Data Science has 3 important pillars: Coding, Statistics and Business. To succeed, you have to be well-versed in all three. In this…

A Product Manager’s Guide to Measuring Things Well Andrea Sipos is a product person with 10 years of experience and a data-reliant approach. She’s worked as a product…

This article is about dating and data science! Please welcome our guest author, Amy Birdee, who has done multiple data science hobby projects recently and built a truly…

Should you negotiate your salary before you get into a junior data scientist role? To start: yes! You should always negotiate. Tech companies in particular EXPECT you to…

This article is about dating and data science! Please welcome our guest author, Amy Birdee, who has done multiple data science hobby projects recently and built a truly…

In this article, I’ll show you a few junior data scientist job interview questions… And also how to answer them. Before we get started… This article is part…

You have an awesome resume, a jaw-dropping portfolio, and a Pulitzer Prize winning cover letter. What’s next? Now we’re getting to the good stuff: applying for a data…

This article is all about how to make your application stand out for data science and analytics positions. I’ll show you what will catch recruiters’ eyes when sifting…

James Rice was a participant in my 6-week data science course (The Junior Data Scientist’s First Month). After finishing the course, he started a cool hobby project and…