L.V.'s Blog – September 2015 Archive (10)

Two great visualizations about data science

The first one is about the difference between Data Science, Data Analysis, Big Data, Data Analytics, and Data Mining:

The source for this one is, according to a tweet, onthe.io. I could not find the article in question, though this website is very interesting, but anyway, I love the above picture,…


Added by L.V. on September 29, 2015 at 4:30pm — 4 Comments

18 Reasons Data Scientists are Difficult to Manage

Of course each data scientist is different, so please take this criticism with a grain of salt. By a long stretch, they don't apply to all data scientists.


  1. Data scientists are creative and bring disruptive IP (intellectual property), and this can cause havoc for their company. 
  2. They can steal and…

Added by L.V. on September 28, 2015 at 6:00pm — 1 Comment

Foundations of Statistical Theory Being Questioned

Interesting article by Regina Nuzzo, posted in Nature.com. Indeed, it's not just p-values that are being questioned, but even the Fisher-Neyman-Pearson (FNP) paradigm and the concept of maximum likelihood estimates (MLE).

Here's an extract published on the American Statistical…


Added by L.V. on September 24, 2015 at 12:00pm — No Comments

100 top data science presentations

We've already published the top big data presentations on slideshare, as well as great Github list of public data sets, or…


Added by L.V. on September 20, 2015 at 1:30pm — No Comments

50+ Free Data Science Books

Very interesting compilation published here, with a strong machine learning flavor (maybe machine learning book authors - usually academics - are more prone to making their books available for free). Many are O'Reilly books freely available. Here we display those most relevant to data science. I haven't checked all the sources, but they seem legit. If you find some issue, let us know in the…


Added by L.V. on September 19, 2015 at 9:00am — 5 Comments

When your data science activities can send you to prison...

Many products or published articles based on data science are heavily regulated, and illegal to perform or publish or sell without a special license, especially in US. You may be doing research and development on a topic considered as classified by the US government. Here a few examples:

  • Steganography (the art and science of hiding secret messages in…

Added by L.V. on September 13, 2015 at 11:00am — 2 Comments

Discover, Access, Distill: The Essence of Data Science

Here's one of the main differences between data engineering and data science: ETL (Extract / Load / Transform) is for data engineers, or sometimes data architects or DBA's.

DAD (Discover / Access / Distill) is for data scientists. Sometimes data engineers do DAD, sometimes data scientists do ETL, but it's rather rare, and when they do it, it's purely internal…


Added by L.V. on September 6, 2015 at 3:30pm — No Comments

Data scientist Demographics: 2015 versus 2013 - How Things Changed (or Not)

Here we compare statistics about two well known top data science websites, 2015 vs. 2013. The 2013 data can be found here. Below are the same stats for these two web properties, as of today. From a methodology point of view, comparing two (or more) websites on two different time periods is much better than comparing just one website on…


Added by L.V. on September 5, 2015 at 3:30pm — No Comments

Job interview questions for data scientists

Here's a selection from Udacity's website. Initially, I intended to post questions from Google or Microsoft hiring managers and recruiters, but you can find these questions by doing a Google search, or…


Added by L.V. on September 5, 2015 at 12:00pm — No Comments

22 easy-to-fix worst mistakes for data scientists

And for software engineers or data analysts as well, in random order:

The list:

  1. Not being able to work well in a team
  2. Being elitist
  3. Using jargon that stakeholders don't understand
  4. Being perfectionist: perfection is always associated with negative ROI, in the business world: 20% of your…

Added by L.V. on September 3, 2015 at 3:30pm — 2 Comments

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