Monthly Archives: June 2013

Box-plot with R – Tutorial

June 6, 2013
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Box-plot with R – Tutorial

Uncertain Demand Forecasting and Inventory Optimizing for Short-life-cycle Products

June 6, 2013
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For short-life-cycle products such as newspapers and fashion, it is important to match the supply with the demand. However, sometimes we order too little from supplier and sometimes we order too much due to the uncertain demand. We would lose sales and customers would be unsatisfied if ordering too little or we would let the

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Inputting Data in Matrix Format

June 6, 2013
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Matrix in R is formed using matrix, rbind, or cbind function. These functions have the following descriptions:matrix - used to transform a concatenated data into matrix form of compatible dimensions. rbind - short for row bind, that binds a conca...

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At what sample size do correlations stabilize?

June 6, 2013
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At what sample size do correlations stabilize?

Maybe you have encountered this situation: you run a large-scale study over the internet, and out of curiosity, you frequently check the correlation between two variables. My experience with this practice is usually frustrating, as in small sample sizes (and we will see what “small” means in this context) correlations go up and down, change sign,

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Hillslope Position by Soil Series

June 5, 2013
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Soil survey data are typically built upon a foundation of soil-landscape relationships that have been verified in the field. SSURGO data contain several geomorphic descriptions of landscape, landform, hillslope position, and surface shape for each...

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KDNuggets 2013 software poll results

June 5, 2013
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KDNuggets 2013 software poll results

The results of the 2013 KDNuggets software poll are in, with RapidMiner and R in a near-tie for first place. Of a record 1880 respondents, 737 reported using Rapid-I RapidMiner/RapidAnalytics, and 704 reported using R. Excel came in third: with 527 respondents, it was the lone commercial tool in the top 5. You can see the top 10 responses...

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Running R Scripts Directly From Dropbox

June 5, 2013
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I have written a little function that allows users to run R scripts out of Dropbox directly from any location.  It was aided by this post on biobucket.  The reason I am particularly interested in this feature is because I am often using a ser...

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Oracle R Distribution for R 2.15.3 is released

June 5, 2013
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Oracle R Distribution for R 2.15.3 is released

We are pleased to announce that Oracle R Distribution (ORD) for R 2.15.3 is available for download today. This update consists of mostly minor bug fixes, and is the final release of the R 2.x series. Oracle recommends using yum to install ORD from our public yum server.  To install...

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The Frisch–Waugh–Lovell Theorem for Both OLS and 2SLS

June 5, 2013
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The Frisch–Waugh–Lovell Theorem for Both OLS and 2SLS

The Frisch–Waugh–Lovell (FWL) theorem is of great practical importance for econometrics. FWL establishes that it is possible to re-specify a linear regression model in terms of orthogonal complements. In other words, it permits econometricians to partial out right-hand-side, or control, variables. This is useful in a variety of settings. For example, there may be cases

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RcppArmadillo 0.3.900.0

A Armadillo release 3.900.0 was provided by Conrad yesterday. It has been rolled into a new RcppArmadillo release 0.3.900.0 which is now on CRAN and in Debian. It has a number of nice changes, mostly on the performance side of things (see below) an...

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