377 search results for "evaluation"

Spatial Randomness Evaluation in R: Monte Carlo Test

May 14, 2012
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Spatial Randomness Evaluation in R: Monte Carlo Test

This post is a some kind of reply to this one.So our goal is to determine whether our point process is random or not. We will use R and spatstat package in particular. Spatstat provides a very handy function for this, that uses K-function combined with...

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Are students’ teaching evaluations influenced by instructors’ looks?

August 3, 2011
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Are students’ teaching evaluations influenced by instructors’ looks?

Are students' teaching evaluations influenced by instructors' looks? ggplot2 may help find the answer.The recent release of RcmdrPlugin.KMggplot2 has made ggplot2 available to those who prefer GUI to the command line interface. With the new plugin for ...

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Forecast estimation, evaluation and transformation

November 9, 2010
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Forecast estimation, evaluation and transformation

I’ve had a few emails lately about forecast evaluation and estimation criteria. Here is one I received today, along with some comments. I have a rather simple question regarding the use of MSE as opposed to MAD and MAPE. If the parameters of a time series model are estimated by minimizing MSE, why do we

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RSI(2) Evaluation

June 28, 2009
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RSI(2) Evaluation

Despite my best efforts, it's been a month since the last post of this series. The first post replicated this simple RSI(2) strategy from the MarketSci Blog using R. The second post showed how to replicate the strategy that scales in/out of RSI(2). ...

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Review of ‘Advanced R’ by Hadley Wickham

May 24, 2015
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Review of ‘Advanced R’ by Hadley Wickham

Executive summary Surprisingly good. And it’s not like my expectations were especially low. Structure There are 20 chapters.  I mostly like the chapters and their order. Hadley breaks the 20 chapters into 4 parts.  He’s wrong.  Figure 1 illustrates the correct way to formulate parts. Figure 1: Chapters and Parts of Advanced R.    Introductory R There The post

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streaming machine learning with RMOA: stream_in > train > predict

streaming machine learning with RMOA: stream_in > train > predict

We will be showcasing our RMOA package at the next R User conference in Aalborg. For the R users who are unfamiliar with streaming modelling and want to be ahead of the Gartner Hype cycle or want to evaluate existing streaming machine learning models, RMOA allows to build, run and evaluate streaming classification models which are built in

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Data Science in HR

May 5, 2015
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Data Science in HR

by Joseph Rickert Last year in a post on interesting R topics presented at the JSM I described how data scientists in Google's human resources department were using R and predictive analytics to better understand the characteristics of its workforce. Google may very well have done the pioneering work, but predictive analytics for HR applications is going mainstream. In...

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How large vectors in R might be stored compactly

April 30, 2015
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How large vectors in R might be stored compactly

Vectors in R can currently have elements of two sizes — 8-byte double-precision floating-point elements for `numeric’ vectors, or 4-byte elements for `integer’ or `logical’ vectors.  You can also have vectors whose elements are 1-byte `raw’ values, but these raw vectors don’t support negative numbers, or NA values, so they aren’t suitable for general use. It seems that lots of

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AusDM 2015 submission deadline extended to Thursday 30 April

April 20, 2015
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AusDM 2015 submission deadline extended to Thursday 30 April

The 13th Australasian Data Mining Conference (AusDM 2015) Sydney, Australia, 8–9 August 2015 (co-located with SIGKDD’15) URL: http://ausdm15.ausdm.org/ The Australasian Data Mining Conference has established itself as the premier Australasian meeting for both practitioners and researchers in data mining. It … Continue reading →

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R 3.2.0 is released (+ using the installr package to upgrade in Windows OS)

April 17, 2015
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R 3.2.0 is released (+ using the installr package to upgrade in Windows OS)

R 3.2.0 (codename “Full of Ingredients”) was released yesterday. You can get the latest binaries version from here. (or the .tar.gz source code from here). The full list of new features and bug fixes is provided below. Upgrading to R 3.2.0 on Windows If you are using Windows you can easily upgrade to the latest version of R using the installr … Continue reading...

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