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Data Analysis Journal
A journal about data analysis, data science, and business intelligence.
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Machine Learning&Data Science
Supervised machine learning — Binary logistic regression overview
Supervised machine learning — Binary logistic regression overview
Predictive modeling (or machine learning) can be challenging to understand and use because there is no one algorithm that would work the…
Olga Berezovsky
Jul 2, 2020
User Activity Analysis In SQL
User Activity Analysis In SQL
A common SQL problem solution and code walkthrough
Olga Berezovsky
Apr 15, 2021
Forecasting modeling in R
Forecasting modeling in R
Building predictions and model forecasts are one of the most common challenges in data analytics. Below I am going to simulate a time…
Olga Berezovsky
Apr 24, 2017
Which ML Algorithm Should I Pick For The Price Estimation?
Which ML Algorithm Should I Pick For The Price Estimation?
There are so many ML algorithms with different levels of complexities, and it can be challenging to figure out which model to choose for…
Olga Berezovsky
Jan 24, 2021
Supervised Machine Learning — An Introduction To Support Vector Machines
Supervised Machine Learning — An Introduction To Support Vector Machines
In my last post, I walked you through Logistic Regression as a binary classification model. In this blog, I’ll share an overview of…
Olga Berezovsky
Jul 14, 2020
Supervised Machine Learning — The Decision Tree Classifier Intro
Supervised Machine Learning — The Decision Tree Classifier Intro
Supervised machine learning offers a variety of regression, classification, and clustering algorithms. In my previous articles, I focused…
Olga Berezovsky
Jul 21, 2020
User Segmentation and Power User Analysis in SQL
User Segmentation and Power User Analysis in SQL
Scaling your user growth can be very challenging and has many strategies. One of which is to analyze your user acquisition and measure…
Olga Berezovsky
Jan 10, 2019
Data sampling in PostgreSQL
Data sampling in PostgreSQL
Working with big data you often have to apply different sampling techniques for your analysis — select a representative subset of data to…
Olga Berezovsky
Jan 18, 2018
SQL Hacks
SQL Interview Questions + Preparation Tips
SQL Interview Questions + Preparation Tips
Be prepared for your next interview
Olga Berezovsky
Jan 24, 2021
Data sampling in PostgreSQL
Data sampling in PostgreSQL
Working with big data you often have to apply different sampling techniques for your analysis — select a representative subset of data to…
Olga Berezovsky
Jan 18, 2018
Exploratory data analysis using Python Pandas and SQL
Exploratory data analysis using Python Pandas and SQL
Pandas Python library is becoming more and more popular between data scientists and analysts. It allows you quickly to load, process…
Olga Berezovsky
Jun 28, 2020
PostgreSQL: joining two tables which are not related by a foreign key relationship
PostgreSQL: joining two tables which are not related by a foreign key relationship
More and more companies are using PostgreSQL, one of the world’s most popular relational database management systems (RDBMS). Personally, I…
Olga Berezovsky
Jun 4, 2017
SQL Date-Time Cheatsheet
SQL Date-Time Cheatsheet
A short guide to steps, solution, and must-know terminology
Olga Berezovsky
Jan 24, 2021
Getting started with SQLite — Pros, cons, and tips
Getting started with SQLite — Pros, cons, and tips
What is SQLite?
Olga Berezovsky
Jul 18, 2017
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