February 2017


February 27, 2017 | Jason C Fisher

Early in my science career I believed that any good piece of software included a graphical user interface (GUI). That was many years ago, and during that time I delved deep into the art of Tcl/Tk programming; using the tcltk package to create GUI’s ... [Read more...]

Reinforcement Learning in R

February 27, 2017 | blogisr

Reinforcement learning has gained considerable traction as it mines real experiences with the help of trial-and-error learning to model decision-making. Thus, this approach attempts to imitate the fundamental method used by humans of learning optimal behavior without the requirement of an explicit model of the environment. In contrast to many ... [Read more...]

Announcing community R workshops

February 27, 2017 | Steph

A big part of why I’ve launched Locke Data is so that I can give back more to my communities. I want to give more time and more support to others. One of the first steps is doing some activities that give financial support to community groups without damaging ... [Read more...]

Tree-based univariate testing

February 26, 2017 | That’s so Random

When building a predictive model it is a good idea to do a univariate analysis, before throwing the whole bunch in a complex algorithm. This way we get a feel for the potential contribution of each predictor. When a lot of predictors are available one can often make a first ...
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Iteration and closures in R

February 26, 2017 | John Mount

I recently read an interesting thread on unexpected behavior in R when creating a list of functions in a loop or iteration. The issue is solved, but I am going to take the liberty to try and re-state and slow down the discussion of the problem (and fix) for clarity. ...
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H-1B Visa Petitions Exploratory Data Analysis

February 24, 2017 | Sharan Naribole

Contributed by Sharan Naribole. He is currently undertaking the part-time online bootcamp organized by NYC Data Science Academy (Dec 2016- April 2017). This blog is based […] The post H-1B Visa Petitions Exploratory Data Analysis appeared first on NYC Data Science Academy Blog.
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More January Package Picks

February 24, 2017 | Joseph Rickert

by Joseph Rickert In a recent post, I highlighted several new packages that arrived on CRAN in January that provided R users with access to data. In this post, I present additional selections for interesting January packages, organized into the categories Miscellaneous, Machine Learning, Statistics and Utilities. Miscellaneous rcss v1.2: ... [Read more...]

Make Power Fun (Again?)

February 24, 2017 | Educate-R - R

Make Power Fun (Again?) Brandon LeBeau University of Iowa Overview (G)LMMs Power simglm package Shiny Demo - Broken! Linear Mixed Model (LMM) Power Power is the ability to statistically detect a true effect (i.e. non-ze... [Read more...]

a riddle at the end of its tether

February 23, 2017 | xi'an

A simply worded riddle this week on The Riddler, about four ropes having non-uniform and unknown burning rates, the only constraint being they all burn completely in one hour. With the help of a lighter (or even a single match), what are the possible units of time one can measure ... [Read more...]

Factor Analysis with the Principal Factor Method and R

February 23, 2017 | Aaron Schlegel

As discussed in a previous post on the principal component method of factor analysis, the term in the estimated covariance matrix , , was excluded and we proceeded directly to factoring and . The principal factor method of factor analysis (also called the principal axis method) finds an initial estimate... The post Factor ... [Read more...]
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