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…
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!
I decided to create a dictionary which unifies the most used data expressions and places them within a clear framework. This is an 54 pages handbook and actually it’s…
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…
Connecting Google Data Studio to your PostgreSQL database is easier than you would think. I will walk you through the whole process step by step. By the end…
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…
Working with SQL for data analysis sometimes requires creating new tables. Do you want to store the output of your SQL queries? Do you need to pull new…
Last time I wrote about why it’s worth it to become a data scientist. This time I’d like to answer another important and very common data science career…
Why become a data scientist? From time to time, I get this question from people who are flirting with the idea of becoming a data professional. Since 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…
Remember, that I told last time that Python if statements are similar to how our brain processes conditions in our everyday life? That’s true for for loops too….
We use if statements in our everyday life all the time – even if our everyday life is not written in Python. If the light is green then…
It’s fair to say that using functions is the biggest advantage of Python. At least you will use them a lot during your Data Science projects! This is…
“Should I learn Python 2 or Python 3?” For everyone who has just started to learn Python for Data Science, this is an important initial question to answer….
You might have heard that Data Scientist was ranked as the best job of 2017 in the USA (based on Glassdoor’s research). Recently many IT professionals have started…
Where we left off? Oh, right, we learned about how to use variables in Python. Here is the second essential topic, that you have to learn, if you…
If you are learning Data Science, pretty soon you will meet Python. Why is that? Because it’s one of the most commonly used data languages. It’s popular for…
In the last 2 weeks I’ve introduced 9 common statistical bias types. If you went through them, you have already done the first very important step to overcome…
It’s time to continue our discourse about Statistical Bias Types. This is part 2 – if you missed part 1, read it here: Statistical Bias Types part 1….
Humans are stupid. We all are, because our brain has been made that way. The most obvious evidence to this built-in stupidity is the different biases, that our…