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Capri Granville's Blog (75)

What are the Typical Data Scientist Profiles on LinkedIn? Survey Results

The charts below represents the main findings of some recent analysis of 1,000 data scientist LinkedIn profiles, using a web scraper. It was limited to Singapore, and for people having "data scientist" on their profile. Of course, many have a different job title especially in fields such as Fintech (quant engineer) or Healthcare (biostatistician) but the findings are interesting nevertherless and seem to apply to other locales as well.

The first chart features the educational…


Added by Capri Granville on September 12, 2019 at 10:00am — 1 Comment

R Users’ Salaries from the 2019 Stackoverflow Survey

Interesting analysis done in R, about salaries of R developers broken down by country, featuring salary range and median salary. 

The dataset consists of survey answers from nearly 90,000 respondents. About 5,000 of them reported using R for “extensive development work over the past year”. The first filter used reduces the dataset from 88,883 respondents to 5,048. The second filter…


Added by Capri Granville on September 5, 2019 at 7:00am — No Comments

Interesting Charts and Maps Obtained Using Census Data

I found an interesting websites featuring hundreds of charts derived from US census data. It shows contrasts between states, cities, regarding education, jobs, languages spoken, salaries, even discrepencies between men and women or Asians and Caucasians, regarding various metrics broken down by location, education, or other criteria. I selected four of these charts.…


Added by Capri Granville on June 10, 2019 at 5:00pm — No Comments

Interesting Type of Chart: Hexagonal Binning

This chart communicates the same insights as a contour plot. What is interesting is the choice of hexagonal buckets (rather than squares) to aggregate data. In fact, any tessellation would work, in particular Voronoi tessellations.…


Added by Capri Granville on June 9, 2019 at 8:00am — 1 Comment

Upcoming Book: Foundations of Data science

Not to be confused with this free Microsoft book with same title.

Data science underlies Amazon's product recommender, LinkedIn's People You Know feature, Pandora's personalized radio stations, Stripe's fraud detectors, and the incredible insights arising from the world's increasingly ubiquitous sensors. In the future,…


Added by Capri Granville on May 23, 2019 at 9:00am — No Comments

Free Book: Statistics, Dataviz, and Data Cleaning with R

I stumbled upon this book by chance, when searching for material about time series (probably the most interesting chapter in this collection.) The various chapters are accessible from the top tabs, on this web page. It is mostly about R, but it has a few interesting chapters on statistical science too. Below is a…


Added by Capri Granville on May 23, 2019 at 9:00am — No Comments

Free Book: Foundations of Data Science (from Microsoft Research Lab)

By Avrim Blum, John Hopcroft, and Ravindran Kannan (2018). 

Computer science as an academic discipline began in the 1960s. Emphasis was on programming languages, compilers, operating systems, and the mathematical theory that supported these areas. Courses in theoretical computer science covered finite automata, regular expressions, context-free languages, and computability. In the 1970s, the study of algorithms was added as an important component of…


Added by Capri Granville on May 23, 2019 at 9:00am — 1 Comment

Three Books About the Mathematics of Data

There are plenty of resources on the Internet to learn linear algebra or to get a refresher, including our own tutorial (here). Below are three interesting books found on Amazon. …


Added by Capri Granville on May 23, 2019 at 9:00am — 1 Comment

Lecture Notes by Andrew Ng : Full Set

The following notes represent a complete, stand alone interpretation of Stanford's machine learning course presented by Professor Andrew Ng and originally posted on the website during the fall 2011 semester. The topics covered are shown below, although for a more detailed summary see lecture 19. The only content not covered here…


Added by Capri Granville on May 23, 2019 at 9:00am — No Comments

Free Textbook: Probability Course, Harvard University (Based on R)

A free online version of the second edition of the book based on Stat 110, Introduction to Probability by Joe Blitzstein and Jessica Hwang, is now available here. Print copies are available via CRC Press, Amazon, and…


Added by Capri Granville on May 23, 2019 at 8:30am — 1 Comment

Google Machine Learning Glossary

This glossary defines general machine learning terms as well as terms specific to TensorFlow. Below is a small selection of the most popular entries. You can access this glossary here. For other related glossaries, follow this link.

  • A/B testing
  • activation…

Added by Capri Granville on May 23, 2019 at 8:30am — No Comments

Funny: Medical Diagnostic and Treatment Algorithm - IBM Watson

Interesting cartoon featuring the decision tree used in medical diagnosis. To see other cartoons about data science, follow this link.…


Added by Capri Granville on April 25, 2019 at 9:00am — 1 Comment

Free Book: Lecture Notes on Machine Learning

Lecture notes for the Statistical Machine Learning course taught  at the Department of Information Technology, University of Uppsala (Sweden.) Updated in March 2019. Authors: Andreas Lindholm, Niklas Wahlström, Fredrik Lindsten, and Thomas B. Schön.

Source: page 61 in these lecture notes…


Added by Capri Granville on April 25, 2019 at 9:00am — No Comments

Data analysis and visualization in Perl

Guest blog by Stephan Loyd.

Hello everybody, this is my first post here, so forgive me if I screw it up.

Let me firstly introduce background of my work. Several years ago I landed onto a Perl job. It also involves some other languages like Python and R, but it was mainly Perl, until last year focus of my role switched and I still do some Perl but much less since then. I was a little…


Added by Capri Granville on April 14, 2019 at 6:30pm — No Comments

Excel Cheat Sheet

This 12-page document lists hundreds of Excel functions and formulas, covering 

  • Lookup/Ref Functions
  • String/Text Functions
  • Date/Time Functions
  • Math/Trig Functions
  • Statistical Functions
  • Logical Functions
  • Information Functions
  • Financial Functions
  • Database Functions
  • Engineering Functions
  • File/Directory Functions
  • Data Type Conv. Functions
  • More Lookup…

Added by Capri Granville on April 7, 2019 at 6:30am — No Comments

30 DeepTech News Briefs

This is the fourth article in a DeepTech Series by Margaretta Colangelo and Dmitry Kaminskiy. Dmitry Kaminskiy, General Partner at Deep Knowledge Ventures, is based in London. Dmitry is Managing Trustee…


Added by Capri Granville on April 4, 2019 at 10:30am — No Comments

[New book] Info We Trust: How to Inspire the World with Data

Creating Info We Trust is a craft that puts the world into forms that are strong and true.  It begins with maps, diagrams, and charts — but must push further than dry defaults to be truly effective. How do we attract attention? How can we offer audiences valuable experiences worth their time? How can we help people access complexity?…


Added by Capri Granville on April 3, 2019 at 8:00am — No Comments

How the Brain Interprets Visualizations

I was comparing home prices in San Francisco between 1994 and 2018, and I noticed that it has increased by a factor 4 over 25 years. In the meanwhile, the inflation index increased by a factor 1.7 (see here.) I am not saying here that my sources are correct or wrong -- entire books have been written on the subject -- but instead, my purpose here is to show how some visualizations can be…


Added by Capri Granville on March 10, 2019 at 5:00pm — 1 Comment

Machine Learning, Deep Learning, and AI Terminology for the Layman

Here is one of the most viral videos about data science posted in the last few months, with over 500,000 views. I could not locate the original copy; I found it in a re-tweet by Kirk Borne. See link to the video below the picture. However, I was able to find who created it ( and it turns out that they have a YouTube channel with plenty of even more interesting videos. To search these videos by keyword, click…


Added by Capri Granville on February 27, 2019 at 3:30pm — No Comments

New Data Science Cheat Sheet, by Maverick Lin

Below is an extract of a 10-page cheat sheet about data science, compiled by Maverick Lin. This cheatsheet is currently a reference in data science that covers basic concepts in probability, statistics, statistical learning, machine learning, deep learning, big data frameworks and SQL. The cheatsheet is loosely based off of The Data Science Design Manual by Steven S. Skiena and An Introduction to Statistical Learning by…


Added by Capri Granville on February 26, 2019 at 7:30pm — No Comments


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