The tragedy of being an Entrepreneur — I asked Myself: “Are You Sure?”. This is the question I asked myself two years ago when I heard about search fund or Entrepreneurship through acquisition. The shocking thing about a simple question is to start a dialogue with yourself a deep conversation that can clarify, and nourish. But before…

Foundations of Data Engineering — The article will be structured into three parts: the first will introduce a couple of definitions; the second part will dive deep into the main difference between a data warehouse and a data lake; and the last part will explain the data mart in an affordable language. Definitions Data Lake People…

The is the first story of our seven stories about machine learning. — When you have two variables, an independent variable X and the dependent variable Y. Linear regression is studying how closely related are these two variables. Basically applying linear regression gives us a number between -1 and 1 that gives us an indication of the the strength of correlation between the…

This is a generic, practical approach that can help you navigate the ambiguity. — Many Python practitioners reached out to me. Asking about which version of Python they should start. My answer to this question is usually something along the lines. Choose the latest version, and check out the differences later on. But if you are looking for job, which one you study…

The best possible method of handling the missing data. Is preventing the problem by well-planning the study and collecting the data carefully. In the last article we talk about missing data. And the different types of missing data. These are Missing Completely at Random (MCAR) . When data is completely…

As a data scientist, I often receive data in which the individuals fail to describe, analyse, or even acknowledge missing data. This is frustrating, as it is often of the utmost importance. Conclusions may change when missing data is accounted for. …

Reservoir Sampling is an algorithm for sampling elements from a stream of data. Imagine you are given a really large stream of data elements, for example: Queries on DuckDuckGo searches in June Products bought at Sainsbury's during the Christmas season Names in the white pages guide. Let me put in…

Given a non-empty array of non-negative integers nums, the degree of this array is defined as the maximum frequency of any one of its elements. Your task is to find the smallest possible length of a (contiguous) subarray of nums, that has the same degree as nums. Example : Input…