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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…
Go to the profile of Olga Berezovsky
Olga Berezovsky
User Activity Analysis In SQL

User Activity Analysis In SQL

A common SQL problem solution and code walkthrough
Go to the profile of Olga Berezovsky
Olga Berezovsky
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…
Go to the profile of Olga Berezovsky
Olga Berezovsky
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…
Go to the profile of Olga Berezovsky
Olga Berezovsky
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…
Go to the profile of Olga Berezovsky
Olga Berezovsky
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…
Go to the profile of Olga Berezovsky
Olga Berezovsky
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…
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Olga Berezovsky
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…
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Olga Berezovsky
SQL Hacks
SQL Interview Questions + Preparation Tips

SQL Interview Questions + Preparation Tips

Be prepared for your next interview
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Olga Berezovsky
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…
Go to the profile of Olga Berezovsky
Olga Berezovsky
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…
Go to the profile of Olga Berezovsky
Olga Berezovsky
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…
Go to the profile of Olga Berezovsky
Olga Berezovsky
SQL Date-Time Cheatsheet

SQL Date-Time Cheatsheet

A short guide to steps, solution, and must-know terminology
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Olga Berezovsky
Getting started with SQLite — Pros, cons, and tips

Getting started with SQLite — Pros, cons, and tips

What is SQLite?
Go to the profile of Olga Berezovsky
Olga Berezovsky
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