459 search results for "evaluation"

Deferred evaluation in Renjin, Riposte, and pqR

July 24, 2013
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Deferred evaluation in Renjin, Riposte, and pqR

The previously sleepy world of R implementation is waking up.  Shortly after I announced pqR, my “pretty quick” implementation of R, the Renjin implementation was announced at UserR! 2013.  Work also proceeds on Riposte, with release planned for a year from now. These three implementations differ greatly in some respects, but interestingly they all try

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Evaluation of Orthogonal Signal Correction for PLS modeling (OSC-PLS and OPLS)

March 15, 2013
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Evaluation of Orthogonal Signal Correction for PLS modeling (OSC-PLS and OPLS)

Partial least squares projection to latent structures or PLS is one of my favorite modeling algorithms. PLS is an optimal algorithm for predictive modeling using wide data or data with  rows << variables. While there is s a wealth of literature regarding the application of PLS to various tasks, I find it especially useful for biological

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Evaluation of Tactical Approaches

June 8, 2012
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Evaluation of Tactical Approaches

Tactical approaches are often chosen based on the best cumulative return which implicitly incorporates significant hindsight bias.  Just because an approach dominates for a period of time does not indicate that it will be the best approach.  ...

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Time-Series Policy Evaluation in R

May 21, 2012
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Time-Series Policy Evaluation in R

Quantifying the success of government policies is clearly important. Randomized control trials, like those conducted by drug companies, are often described as the ‘gold-standard’ for policy evaluation. Under these, a policy is implemented in/to one area/group (treatment), but not in/to another (control). The difference in outcomes between the two areas or groups represents the effectiveness

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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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The Data Mining Process: Modeling

February 1, 2016
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Happy new year, everyone! Continuing this series on the data mining process that has previously examined understanding business problems and associated data as well as data preparation,  this post focuses on modeling. Developing models calls for using specific algorithms to explore, recognize, and ultimately output any patterns or themes in your data.  The two goals of modeling are to classify or predict. Some The post

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I will survive!

January 25, 2016
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Here's a very long post, to make up for the recent silence on the blog... Lately, I've been working on a new project involving the use of survival analysis data and results, specifically for health economic evaluation (cue Cake's rendition below).I hav...

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