3273 search results for "MAP"

Uncovering the Preferences Shaping Consumer Data: Matrix Factorization

July 23, 2014
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Uncovering the Preferences Shaping Consumer Data: Matrix Factorization

How do you limit your search when looking for a hotel? Those trying to save money begin with price. Members of hotel reward programs focus on their brand. At other times, location is first to narrow our consideration set. What does hotel search re...

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Rcpp11 3.1.1

July 22, 2014
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R 3.1.1 was released a few days ago, and as part of the policy we are trying to follow for Rcpp11 releases, here is Rcpp11 3.1.1. Sorry for the 12 days delay, but I was away in California, and Rcpp11 travelled with me, so I could not properly test the ...

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The Rise and Fall of the name Jennifer

July 19, 2014
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The Rise and Fall of the name Jennifer

A recent fascinating post by Analysis at Large got me interested in naming trends analysis. The original post used Social Security data by state to map out the more frequent names by state. While this sounded interesting it turned out a single name (yo...

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US Names by State: Part I (Mary is everywhere!)

July 18, 2014
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US Names by State: Part I (Mary is everywhere!)

I was browsing the Social Security Administration’s website and found a link for the open government initiative (http://www.ssa.gov/open/data/).  There seems to be a fair amount of interesting data here, but I grabbed the names of people born in the US … Continue reading →

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Why hadn’t I written a function for that?

July 16, 2014
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Why hadn’t I written a function for that?

I’m often typing the same bits of code over and over. Those bits of code really should be made into functions. For example, I’m still using base graphics. (ggplot2 is on my “to do” list, really!) Often some things will be drawn with a slight overlap of the border of the plotting region. And in

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Taking Inventory: Analyzing Data When Most Answer No, Never, or None

July 15, 2014
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Taking Inventory: Analyzing Data When Most Answer No, Never, or None

Consumer inventories, as the name implies, are tallies of things that consumers buy, use or do. Product inventories, for example, present consumers with rather long lists of all the offerings in a category and ask which or how many or how often they bu...

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Preparing Big Data for Analysis in R

July 15, 2014
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Preparing Big Data for Analysis in R

by Yaniv Mor, Co-founder & CEO of Xplenty How do you get Big Data ready for R? Gigabytes or terabytes of raw data may need to be combined, cleaned, and aggregated before they can be analyzed. Processing such large amounts of data used to require installing Hadoop on a cluster of servers, not to mention coding MapReduce jobs in...

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Consistent naming conventions in R

July 15, 2014
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Consistent naming conventions in R

Naming conventions in R are famously anarchic, with no clear winner and multiple conventions in use simultaneously in the same package. This has been written about before, in a lucid article in the R Journal, a detailed exploration of names in R source code hosted on CRAN and general discussion on stackoverflow. Basically, there are 5 naming...

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R Notes: vectors

July 12, 2014
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  R is different from C family languages. It has a C syntax, but a Lisp semantics. Programmers from C/C++/Java world would find many usages in R adhoc and need to memorize special cases. This is because they use R from a C's perspective. R is a very...

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Sometimes I feel (some) need for speed

July 11, 2014
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Sometimes I feel (some) need for speed

I’m the first to acknowledge that most of my code could run faster. The truth of the matter is that, in essence, I write ‘quickies’: code that will run once or twice, so there is no incentive to spend days or hours in shaving seconds of a computation. Most analyses of research data fall in

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