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Vincent Granville's Blog – July 2014 Archive (15)

The law of series: why 4 plane crashing in 6 months is a coincidence

Very short time periods (6 months) with several crashes, as well as long time periods (3 years) with no crashes are expected. An even distribution of plane crashes is indeed NOT expected - it would look very suspicious, and definitely not random. Here we assume that all events (plane crashes) are independent. We also assume that the average is two major plane crashes per year - which is realistic if you include all passenger airlines flying anywhere in the world - sometimes in dangerous…

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Added by Vincent Granville on July 31, 2014 at 8:30pm — 2 Comments

Five expert tips to bring your employee churn to a halt

Guest blog post by Mike Kennedy, from Talent Analytics.

The importance of finding the right employee from the start may seem like common sense, but is there a smarter way to reduce the time and money you spend hiring staff?

The answer is data, according to Greta Roberts, chief executive officer and…

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Added by Vincent Granville on July 31, 2014 at 9:30am — No Comments

Weekly Digest - August 4

The full version is always published Monday. Starred articles are new additions or updated content, posted between Thursday and Sunday. If you haven't received this message in your mailbox, read this notice.

Sponsored Announcement

INFORMS…

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Added by Vincent Granville on July 29, 2014 at 2:00pm — No Comments

Cassandra Modeling for Real-Time Analytics

by Elliott Cordo, chief architect at Caserta Concepts. Exclusive to Data Science Central.

There is much discussion these days about Lambda Architecture and its benefits for developing high performance analytic architectures.  It offers a combination of a high performance, low latency ETL with a real-time layer, and a slower, more accurate, and flexible solution that runs in batch.  

As I work…

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Added by Vincent Granville on July 29, 2014 at 8:00am — No Comments

Word Clouds of Big Data, Data Science and Other Buzz Words

Guest blog post by Dr. Livan Alonso. 

Twitter has more than 250 million monthly active users who tweet more than 500 millions tweets per day. In the case someone is following many people, it isn’t feasible to read each tweet from them.

Do you have any idea about what people are twitting about Data Science, Big Data, Business Analytics, Hadoop, Machine Learning or R programming?

Word clouds are one of the simplest and most intuitive ways of visualizing text data.…

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Added by Vincent Granville on July 28, 2014 at 6:30pm — 2 Comments

16 analytic disciplines compared to data science

What are the differences between data science, data mining, machine learning, statistics, operations research, and so on?

Here I compare several analytic disciplines that overlap, to explain the differences and common denominators. Sometimes differences exist for nothing else other than historical reasons. Sometimes the differences are real and subtle. I also provide typical job titles, types of analyses, and industries traditionally attached to each discipline. Underlined domains are…

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Added by Vincent Granville on July 24, 2014 at 7:00pm — 28 Comments

Weekly Digest - July 28

The full version is always published Monday. Starred articles are new additions or updated content, posted between Thursday and Sunday.

Sponsored Announcement

Just as information is the lifeblood of healthcare, data science is at the heart of the 100 percent online Master of Science degree in Health Informatics at the College of St.…
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Added by Vincent Granville on July 23, 2014 at 2:30pm — No Comments

10 types of regressions. Which one to use?

Should you use linear or logistic regression? In what contexts? There are hundreds of types of regressions. Here is an overview for data scientists and other analytic practitioners, to help you decide on what regression to use depending on your context. Many of the referenced articles are much better written (fully edited) in my data science Wiley book.…

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Added by Vincent Granville on July 21, 2014 at 7:30pm — 13 Comments

The fastest growing data science / big data profiles on Twitter

This article is co-authored with Dr. Livan Alonso Sarduy. The two charts below are based on a number of Twitter followers and their growth rate, after filtering out irrelevant or fake followers. Our next step is to identify top data science Twitter accounts, that are themselves followed by many other top data science Twitter accounts: in our opinion,…

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Added by Vincent Granville on July 16, 2014 at 6:30pm — 2 Comments

Weekly Digest - July 21

The full version is always published Monday. Starred articles are new additions or updated content, posted between Thursday and Sunday.

Featured Articles

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Added by Vincent Granville on July 16, 2014 at 2:30pm — No Comments

10 Features all Dashboards Should Have

Here are 10 rules to design great, simple, efficient, adaptive dashboards.

  1. Decide which metrics should be included in your dashboard. Some metrics such as measuring the impact of sharing and likes, on email marketing campaigns, are not easy to estimate. Out-of-dashboard statistical modeling might…
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Added by Vincent Granville on July 11, 2014 at 9:30am — 1 Comment

Weekly Digest - July 14

The full version is always published Monday. Starred articles are new additions or updated content, posted between Thursday and Sunday.

Announcements

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Added by Vincent Granville on July 7, 2014 at 9:30am — No Comments

30 interesting statistics about social media

Guest blog post by Carla Gentry (@data_nerd), initially posted here.

Below are 30 of the top stats that can help you either sell social media to the higher ups in your company or help you in securing additional resources for your company’s social program.

  • 5 percent of online shoppers note that social media influenced them to visit…
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Added by Vincent Granville on July 6, 2014 at 1:30pm — 1 Comment

Top Data Scientists on Twitter

There are many lists of top data scientists on Twitter. Here we mention and comment one of them, published on BigData-MadeSimple; most other lists have similar drawbacks. It has been argued that the overlap between my Top 25 data scientists on LinkedIn and the Twitter…

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Added by Vincent Granville on July 5, 2014 at 8:30am — 2 Comments

Weekly Digest - July 7

The full version is always published Monday. Starred articles are new additions or updated content, posted between Thursday and Sunday.

Featured Articles

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Added by Vincent Granville on July 2, 2014 at 9:30am — No Comments

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