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70 MongoDB Interview Questions and Answers

According to Wikipedia, MongoDB is a cross-platform document-oriented database. Classified as a NoSQL database, MongoDB avoids the traditional table-based relational database structure in favor of JSON-like documents with dynamic schemas (MongoDB calls the format BSON), making the integration of data in certain types of applications easier and faster. MongoDB is developed by MongoDB Inc. and is published as free and open-source software. MongoDB is the fourth most popular type of database…


Added by Laetitia Van Cauwenberge on May 3, 2016 at 9:00am — No Comments

Treacherous Visualizations: How To Detect and Fix Them

Here I discuss my prediction about the worst 15-year long (yet unabated) real estate bubble: this is an example where visualizations, when not carefully selected and put into context, can be seriously misleading, even for top experts. Here I also provide some hints to help you avoid these visualization traps. This article shows how data scientists should think, when confronted to charts such as the one below.…


Added by Vincent Granville on May 3, 2016 at 7:30am — 1 Comment

Top 10 Hot Data Science Technologies

In April, Gil Press posted a list of top 10 hot big data technologies in Forbes Magazine. The technologies being featured as hot were:

  • Predictive analytics
  • NoSQL databases
  • Search and knowledge discovery
  • Stream analytics
  • In-memory data fabric
  • Distributed file stores
  • Data virtualization
  • Data…

Added by Vincent Granville on May 2, 2016 at 9:30am — No Comments

Top 5 Tools and Languages for Data Science

Guest blog post by Jason O’Rawe – ODSC data science team contributor.

Data science is an interdisciplinary endeavor, and it serves the purpose of extracting insight from varying sources of information. Various communities come together at Data Science Conferences to share their knowledge and promote innovation. It is not surprising, then, that the tools showcased by data scientists at ODSC East are myriad, but what are the most valued and popular programming languages in a…


Added by Vincent Granville on May 1, 2016 at 9:52pm — No Comments

Following the Odour of Data - Catching Scent

In recent blogs, I wrote about using codified narrative as a form of data. I also discussed using attribution models to systematically evaluate codified narrative for ontological constructs: e.g. "child abuse" "physical confinement" "cannibalism." I provide a brief overview of these topics a bit later in the blog. The third important piece to make use of narrative data involves "attribution profiling" in a process that I call "catching scent." Following the odour of data involves…


Added by Don Philip Faithful on April 29, 2016 at 4:44am — 1 Comment

Deep Learning Demystified

Guest blog post by Christopher Dole and other contributors, originally posted here. Created by SoothSayerAnalytics. 

Deep Learning is one of the most revolutionary and disruptive technologies ever developed in Data Science.  Essentially, this is…


Added by Vincent Granville on April 28, 2016 at 7:30pm — No Comments

15 Astonishing Tweetable Facts About Analytics

Big data and its conjoined twin analytics are the business buzzwords of the decade to be sure — and for good reason. Because of advances in technology and computing, we’re generating more data than ever before.  A lot more.  And we’re learning how to put it to good use.

Whether you’re the IT guy trying…


Added by Bernard Marr on April 28, 2016 at 4:00pm — No Comments

21 Scary Things Big Data Knows About You

What does big data know about you?

Quite a lot.

Every time we use a computer, access our phones, or open an app on a tablet, we’re leaving a digital trail. Most people are vaguely aware that Google knows what they’ve searched for, or that Facebook knows who their friends are, but it goes much, much deeper than that.…


Added by Bernard Marr on April 28, 2016 at 4:00pm — No Comments

Data has always existed, the key is the right data

What does The Library of Alexandria, The Normans and a book have to do with data? I never thought about

The Library... Alexandria was in charge of collecting all the world's knowledge, and most of the staff was occupied with the task of translating works onto papyrus paper... 1

Or The Normans and the...

Domesday Book (Latin:…


Added by George Psistakis on April 28, 2016 at 2:22am — No Comments

2.5 Quintillion Reasons to use Real World Evidence

NEHI puts a price on patients not adhering to treatment. It’s $290 Billion worth of a new problem for the pharmaceuticals industry – getting beyond the pill to influence the behaviours or patients and thereby influence the outcomes on which their reimbursements, and ultimately profitability, depends. Investment in patient access and adherence technology and programs is set to increase exponentially over the next five years, but if this investment is going to pay off, the data strategy to…


Added by Kevin A'court on April 28, 2016 at 12:00am — No Comments

Weekly Digest, May 2

Starred articles are new additions posted between Thursday and Sunday, published in the Monday edition exclusively. The Monday edition has six sections: (1) Featured Resources and Technical Contributions, (2) Featured Articles and Case Studies, (3) From our Sponsors, (4) News, Events, Books, Training, Forum Questions, (5) Picture of the Week, and (6) Syndicated Content. The Thursday edition covers articles…


Added by Vincent Granville on April 27, 2016 at 3:30pm — No Comments

To Pie Chart or Not to Pie Chart?

Oh, the poor, maligned pie chart. The chart type that gets pushed around and bullied on the data-viz playground more than any other. Randal Olsen of /r/dataisbeautiful ran a Twitter poll asking, “Do you think pie charts should be banned from #dataviz?” Scientific or not, nearly two in five responded affirmatively:…


Added by Ben Jones on April 27, 2016 at 2:15pm — No Comments

The New Rules for Becoming a Data Scientist

Summary:  What do you need to do to get an entry level job in data science?

This article is written for anyone who is considering becoming a data scientist.  That includes young people just starting their bachelor’s degrees and folks in the first two or three years…


Added by William Vorhies on April 26, 2016 at 2:30pm — 2 Comments

3 Ways to Use Big Data to Drive Your Content Marketing Strategy

Now I’m preaching to the choir when I tell you that big data is the future. You all know that already. Article after article on this website is devoted to the idea that if we use big data correctly, it can be worth its weight in digital gold. The question is, are you actually using it correctly,…


Added by Julie Ellis on April 26, 2016 at 4:12am — No Comments

When Does Deep Learning Work Better Than SVMs or Random Forests?

Guest blog by Sebastian Raschka, originally posted here.  

If we tackle a supervised learning problem, my advice is to start with the simplest hypothesis space first. I.e., try a linear model such as logistic regression. If this doesn't work "well" (i.e., it doesn't meet…


Added by Vincent Granville on April 25, 2016 at 8:30pm — 2 Comments

Conscious, Sub-conscious and un-conscious sides of data science

Thanks to Sigmund Fraud for all the fascinating discoveries in human Psychology. I have always been fascinated about how human psychology plays a vital role in decisions we make and how it is inevitable to be understand how human psychology works before you get into improving customer experience and talking about machines replacing human thinking.
One of the major discoveries which Fraud has is around the different states of mind, namely, conscious, sub-conscious and…

Added by Gaurav Kumar on April 23, 2016 at 3:12pm — 2 Comments

Application Of Analytics in Security Systems

Security in today’s world is one of the key concerns for the corporations today. It includes both the data (in different forms) and physical instruments / devises. How secure is my data these days as most of the data is stored at remote locations, which was not the situation few years ago. Now with the advancement of technology, companies are looking for better security to their information.

Major concerns are:

• How can the data be protected?

• How trusted is the security… Continue

Added by Tanmay Bhandari on April 22, 2016 at 9:13pm — No Comments

The Role of Data Science in Web Design

Web designers avoid data because most of them are not comfortable dealing with it. But, as we are progressing ahead towards a more digital age, designers have the responsibility to produce highly effective data driven designs. 

Invariably, data science is playing—and will continue to play—a large role in web design. The designers need to educate themselves about the rapidly growing trend of data-driven design…


Added by Joydeep Bhattacharya on April 22, 2016 at 9:12pm — No Comments

Learning R in Seven Simple Steps

Guest blog post by Martijn Theuwissen, co-founder at DataCamp. Other R resources can be found here, and R Source code for various problems can be found here. A data science cheat sheet can be found…


Added by Vincent Granville on April 22, 2016 at 8:00am — 2 Comments

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