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…
100% practical 6-week data science challenge & video course — simulating of being a junior data scientist at a true-to-life startup.
Learning SQL is very useful for anyone in the online world. And it’s a definite must for Data Analysts/Scientists! Here are 8 articles to start with…
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!
Read these 7 free articles about Bash/Command Line and take your very first step to learn the basics of coding for Data Science!
Scraping one web page is fun, but scraping more web pages is more fun. In this tutorial you’ll learn how to do just that; along the way you’ll…
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…
I get this question a lot: What’s the best computer (or laptop) for a data scientist? In this article, I’ll answer it in detail and I’ll add specific…
A few years ago we were running a major homepage A/B test with one of my clients. Huge traffic, huge potential, huge expectations — and huge risk, of…
Did you flirt with the idea of learning data science? You are not alone. This has been a really hot topic in the last few years and it…
Over the last 6 years I’ve been part of many job interviews – on both sides of the table. The most fun, but also the most feared, part…
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…
Last time I wrote about Python For Loops and If Statements. Today we will talk about how to combine them. In this article, I’ll show you – through a…
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…
Today I’ll show you the most essential SQL functions that you will use for finding the maximums or the minimums (MAX, MIN) in a data set and to…
If you want to fit a curved line to your data with scikit-learn using polynomial regression, you are in the right place. But first, make sure you’re already…
This is the final part of the Beautiful Soup tutorial series. Just to remind you, here’s what you’ve done so far: in episode #1 you learnt the basics…
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…
Our guest author today is Joachim Schork from Statistics Globe. I asked Joachim to give us an intro to a data language that we haven’t covered so far…
In this article, I’ll show you how to use Jupyter Notebook. Jupyter is one of the most popular tools if you want to work with Python. It’s especially…
Do you remember when I told you in the first tutorial that “sooner or later you’ll come to a point where you have to collect large amounts of…
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…
Data Science on the job is different from the things you see about it in tutorials. I wish someone would’ve told me about these when I was an…
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…
As a data scientist or data analyst, sooner or later you’ll come to a point where you have to collect large amounts of data. Be it a hobby…
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…
Hello fellow job seekers! My name is Peter. About a year ago, I was in your shoes. I wanted one of those high-paying jobs in data science and…