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Michael Gracie

Coursera Data Science Specialization: A Student’s Review

datasciencelogoCoursera is a pure play online education provider distributing classes in a wide variety of subjects, from The Music of the Beatles to Analyzing Global Trends for Business and Society. Many courses are offered in the native languages of those who developed them, such as Peking University’s Methodologies in Social Research, while others have been translated for more widespread use – see Yale’s Financial Markets instructed by Prof. Robert Shiller (I’m a fan).

Part of the Massive Open Online Course (or “MOOC”) site’s push is linking courses developed by accredited higher-learning institutions into specializations, series of classes designed to develop skills in a particular field. There are seven specializations as of this writing, and the one I dove into is called Data Science.

Made up of nine segments created by Johns Hopkins University’s Bloomberg School of Public Health – taught by Professor Brian Caffo and Assistant Professors Roger Peng and Jeff Leek – it’s a half-year commitment for Energizer bunnies with a math/programming bent, and probably twelve to eighteen months if right this moment you’re distracted by your Instagram feed. Ok, maybe twenty-four to thirty-six.

Yours truly took the fast track, doubling and tripling up on classes at the outset, leaving the purportedly hard stuff for the windup to winter solstice. What follows is a summary of each class, including comparison to what was “sold”, tips for getting the most from them i.e. scoring well and then some, as well as supplementary materials discovered that turned out worthwhile. It’s the truth within from a dedicated student’s point of view, and a long road. So feel free to skip to the conclusions; just don’t make fun of my grades.

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DataCamp is roast tenderloin for the brain

Unless you’ve been living under a rock, you’ve probably heard the term big data. Yes, there’s a lot of bits and bytes out there, created not only by sheer prevalence of tweets about microwaveable mac n’ cheese (and cats … lots of cats), but also via trivial technological advances in the areas of computer security, genome sequencing, and even what bar you’re drinking at geo-location. With all these haystacks came the desire for finding needles; as a result number crunching has undeniably experienced a renaissance.

I became curious about what it all meant. But seeing as I was a “B” student (on a good day) when it came to sample sizes and p-values – preferring debits, credits and present value calculations to wondering why anyone would make decisions based on a measurement that sounded like a hot drink (squared) – the whiskered was summarily sent to its demise.

Last summer I signed on for a nine-course regimen in this data science, offered by Johns Hopkins University in conjunction with Coursera, fully expecting it to be a pile of mumbo jumbo I could whiz through before year’s end. A comprehensive review of those courses is planned for publication here in early 2015, and I can state with 95% confidence that I’ll meet the hard deadline. However, I lied; I was really a “C” student in regression and the like (when I even went to class), so the series subject matter was, in several cases both proverbially and actually, more than I bargained for.

To weed through the mess, truly comprehend the fundamentals, and find some nuggets of practicality within required an investment significantly in excess of my original, cocksure estimate. In addition to the acquisition of several texts in statistical inference, modeling and prediction, I also found some excellent online resources to assist in the cause. One of those was DataCamp, an R-programming oriented teaching tool which turned out to be a savior during the work. Real learn-as-you-do material.

datacamp

So without further ado – that is, barring failure to recall that less than one standard deviation from the mean does not a null hypothesis rejection make (which I might) – I give the site two big thumbs up.

MG signing off (because he still can’t simulate a random normal distribution with R, but he fakes it like a champ)

Tech talking out of both sides of its mouth

hy·poc·ri·sy
hiˈpäkrisē/
noun
noun: hypocrisy; plural noun: hypocrisies

    1. the practice of claiming to have moral standards or beliefs to which one’s own behavior does not conform; pretense.

Bob Hoffman calls out those steeped in the practice:

The Silicon Valley aristocracy, who have made billions and billions of dollars by collecting ungodly amounts of personal information about us, came out in force yesterday to denounce governments for collecting ungodly amounts of personal information about us.

They’re shocked — shocked I tell you! — at the intrusion into our privacy.

I have two words for these greedy, lying, hypocrites: screw you.

It’s one of the finer rants I’ve have seen on the interwebspheres, and is worth a full read.

Privacy invasion aside, I think big data marketing is not the panacea it is believed to be. Further, as the data set continues to grow, the return on mining investment will head the opposite direction.

MG signing off (to reset Safari, much as he does after almost every web page he visits)