Mixed models for ANOVA designs with one observation per unit of observation and cell of the design

May 29, 2017
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Mixed models for ANOVA designs with one observation per unit of observation and cell of the design

Together with David Kellen I am currently working on an introductory chapter to mixed models for a book edited by Dan Spieler and Eric Schumacher (the current version can be found here). The goal is to provide a theoretical and practical introduction that is targeted mainly at experimental psychologists, neuroscientists, and others working with experimental

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Instrumental Variables in R exercises (Part-3)

May 29, 2017
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Instrumental Variables in R exercises (Part-3)

This is the third part of the series on Instrumental Variables. For other parts of the series follow the tag instrumental variables. In this exercise set we will use...

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Manipulate Biological Data Using Biostrings Package Exercises(Part 2)

May 28, 2017
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Manipulate Biological Data Using Biostrings Package Exercises(Part 2)

Bioinformatics is an amalgamation Biology and Computer science.Biological Data is manipulated using Computers and Computer software’s in Bioinformatics. Biological Data includes DNA; RNA & Proteins. DNA & RNA is...

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L.A. Unconf-idential : a.k.a. an rOpenSci #runconf17 Retrospective

May 28, 2017
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L.A. Unconf-idential : a.k.a. an rOpenSci #runconf17 Retrospective

Last year, I was able to sit back and lazily “RT” Julia Silge’s excellent retrospective on her 2016 @rOpenSci “unconference” experience. Since Julia was not there this year, and...

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5 ways to measure running time of R code

May 27, 2017
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5 ways to measure running time of R code

A reviewer asked me to report detailed running times for all (so many :scream:) performed computations in one of my papers, and so I spent a Saturday morning figuring...

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An Interesting Study: Exploring Mental Health Conditions in the Tech Workplace

May 27, 2017
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An Interesting Study: Exploring Mental Health Conditions in  the Tech Workplace

Contributed by Bo Lian. This blog post is the first class project on Exploratory Visualization & Shiny. Please check  the Shiny App here. Background and Motivation The post

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Data Science for Business – Time Series Forecasting Part 1: EDA & Data Preparation

May 27, 2017
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Data Science for Business – Time Series Forecasting Part 1: EDA & Data Preparation

Data Science is a fairly broad term and encompasses a wide range of techniques from data visualization to statistics and machine learning models. But the techniques are only tools...

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tidyquant: R/Finance 2017 Presentation

tidyquant: R/Finance 2017 Presentation

The R/Finance 2017 conference was just held at the UIC in Chicago, and the event was a huge success. There were a ton of high quality presentations really showcasing...

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Oakland Real Estate – Full EDA

Oakland Real Estate – Full EDA

Living in the Bay Area has led me to think more and more about real estate (and how amazingly expensive it is here…)  I’ve signed up for trackers on...

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Testing the Hierarchical Risk Parity algorithm

May 26, 2017
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Testing the Hierarchical Risk Parity algorithm

This post will be a modified backtest of the Adaptive Asset Allocation backtest from AllocateSmartly, using the Hierarchical Risk Parity … Continue reading →

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Canada Immigration: Where to settle in? Exercises

May 26, 2017
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Canada Immigration: Where to settle in? Exercises

Many people around the globe would like to immigrate to Canada as a Skilled Worker. These candidates must prove language proficiency in French and English, at least 2 years...

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Who is the caretaker? Evidence-based probability estimation with the bnlearn package

May 26, 2017
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Who is the caretaker? Evidence-based probability estimation with the bnlearn package

by Juan M. Lavista Ferres , Senior Director of Data Science at Microsoft In what was one of the most viral episodes of 2017, political science Professor Robert E...

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Managing Spark data handles in R

May 26, 2017
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Managing Spark data handles in R

When working with big data with R (say, using Spark and sparklyr) we have found it very convenient to keep data handles in a neat list or data_frame. Please...

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Versioning R model objects in SQL Server

May 26, 2017
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High-level info If you build a model and never update it you’re missing a trick. Behaviours change so your model will tend to perform worse over time. You’ve got...

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RQGIS release 1.0.0

May 26, 2017
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RQGIS release 1.0.0

Today we are proud to announce a major release of the RQGIS package providing an interface between R and QGIS. We have completeley rewritten RQGIS by now using reticulate...

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rtdists 0.7-2: response time distributions now with Rcpp and faster

May 26, 2017
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rtdists 0.7-2: response time distributions now with Rcpp and faster

It took us quite a while but we have finally released a new version of rtdists to CRAN which provides a few significant improvements. As a reminder, rtdists rovides...

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MapReduce in Two Modern Paintings

May 25, 2017
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MapReduce in Two Modern Paintings

Two years ago we had a rare family outing to the Dallas Museum of Art (my son is teenager and he's into sport after all)....

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Civic Data Wrangling: in R and on data.world

May 25, 2017
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Civic Data Wrangling: in R and on data.world

One of the most valuable things I have learned working on Data for Democracy’s Medicare drug spending project has been the value of collaborative tools. It has been my...

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Shiny Application Layouts Exercises (Part-10)

May 25, 2017
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Shiny Application Layouts Exercises (Part-10)

Shiny Application Layouts – Shiny Themes In the last part of the series we will check out which themes are available in the shinythemes package. More specifically we will...

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CI for difference between independent R square coefficients

May 25, 2017
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CI for difference between independent R square coefficients

In an earlier blog post I provided R code for a CI of a difference in R square for dependent and non-dependent correlations. This was based on a paper...

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Love is all around: Popular words in pop hits

May 25, 2017
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Love is all around: Popular words in pop hits

Data scientist Giora Simchoni recently published a fantastic analysis of the history of pop songs on the Billboard Hot 100 using the R language. Giora used the rvest package...

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The Sierpinski Triangle: Visualising infinity in R

May 24, 2017
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The Sierpinski Triangle: Visualising infinity in R

Using the R programming language to draw the Sierpinski triangle fractal using the chaos game. Drawing a fractal using random numbers. Continue reading → The post

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Prediction intervals for NNETAR models

May 24, 2017
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The nnetar function in the forecast package for R fits a neural network model to a time series with lagged values of the time series as inputs (and possibly...

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Subplots in maps with ggplot2

May 24, 2017
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Subplots in maps with ggplot2

Following the surprising success of my latest post, I decided to show yet another use case of the handy ggplot2::annotation_custom(). Here I will show how to add small graphical...

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Euler Problem 22 : Names Scores

May 24, 2017
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Euler Problem 22 : Names Scores

A proposed solution in the R language to Euler Problem 22. What is the total of all the name scores in the file of 5163 first names? Continue...

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A recipe for dynamic programming in R: Solving a “quadruel” case from PuzzlOR

May 24, 2017
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As also described in Cormen, et al (2009) p. 65, in algorithm design, divide-and-conquer paradigm incorporates a recursive approach in which the main problem is: Divided into smaller sub-problems...

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How brute is your force?: Three ways to get radicals in batch using R

May 24, 2017
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How brute is your force?: Three ways to get radicals in batch using R

Brute force approach to solving a problem is usually the way of running through all possible combinations and repeating a certain calculation. Until a more elegant solution is devised...

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Data wrangling : I/O (Part-1)

May 24, 2017
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Data wrangling : I/O (Part-1)

Data wrangling is a task of great importance in data analysis. Data wrangling, is the process of importing, cleaning and transforming raw data into actionable information for analysis. It...

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Microsoft R Open 3.4.0 now available

May 24, 2017
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Microsoft R Open (MRO), Microsoft's enhanced distribution of open source R, has been upgraded to version 3.4.0 and is now available for download for Windows, Mac, and Linux. This...

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