Alex Olteanu
Alex Olteanu
Author Archives: Alex Olteanu

Data Science Portfolio Project: Where to Advertise an E-learning Product

At Dataquest, we strongly advocate portfolio projects as a means of getting a first data science job. In this blog post, we’ll walk you through an example portfolio project. The project is part of our Statistics Intermediate: Averages and Variability course, and it assumes familiarity with: Sampling (populations, samples, sample representativity) Frequency distributions Box plots […]

Data Science Portfolio Project: Is Fandango Still Inflating Ratings?

At Dataquest, we strongly advocate portfolio projects as a means of getting your first data science job. In this blog post, we’ll walk you through an example portfolio project. The project is part of our Statistics Fundamentals course, and it assumes some familiarity with: Sampling (simple random sampling, populations, samples, parameters, statistics) Variables Frequency distributions […]

A Data Science Project Style Guide

Employers usually give a lot of weight to a candidate’s portfolio when hiring for a junior data science role. Although you may be capable of technically impressive projects, your job hunt will suffer if you don’t pay enough attention to the stylistic aspects as well. A busy employer is not going to review poorly constructed […]

Learning Curves for Machine Learning

Diagnose Bias and Variance to Reduce Error When building machine learning models, we want to keep error as low as possible. Two major sources of error are bias and variance. If we managed to reduce these two, then we could build more accurate models. But how do we diagnose bias and variance in the first […]

How to Generate FiveThirtyEight Graphs in Python

If you read data science articles, you may have already stumbled upon FiveThirtyEight’s content. Naturally, you were impressed by their awesome visualizations. You wanted to make your own awesome visualizations and so asked Quora and Reddit how to do it. You received some answers, but they were rather vague. You still can’t get the graphs […]

Web Scraping with Python and BeautifulSoup

To source data for data science projects, you’ll often rely on SQL and NoSQL databases, APIs, or ready-made CSV data sets. The problem is that you can’t always find a data set on your topic, databases are not kept current and APIs are either expensive or have usage limits. If the data you’re looking for […]

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