Monthly Archives: June 2012

2 min HOWTO in R

June 6, 2012
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Lots of short videos on how to do several things in R.

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R-NOLD 2012-06-06 03:18:00

June 6, 2012
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R-NOLD 2012-06-06 03:18:00

While traveling across the Visayas, I encountered barangay (villages) with the name same as my last name. Using R and map data from gadm.org I search and mapped other villages in the country named “Salvacion”.

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Managing the deluge of DNA data

June 5, 2012
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Managing the deluge of DNA data

The explosion in DNA sequencing capacity has shifted the experimental bottleneck from sequencing to analyzing and interpreting sequences. The bioconductor package cummeRbund uses ggplot as part of its tool set for organizing, exploring and visualizing ...

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Constants and ARIMA models in R

June 5, 2012
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Constants and ARIMA models in R

This post is from my new book Forecasting: principles and practice, available freely online at OTexts.com/fpp/. A non-seasonal ARIMA model can be written as (1)   or equivalently as (2)   where is the backshift operator, and is the mean of . R uses the parametrization of equation (2). Thus, the inclusion of a constant in a non-stationary ARIMA...

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Quasi-Random Number Generation in R

Random number generation is a core topic in numerical computer science. There are many efficient algorithms for generating random (strictly speaking, pseudo-random) variates from different probability distributions. The figure below shows a sampling of 1000 two-dimensional random variates from the … Continue reading →

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F-test to find UECLs

June 5, 2012
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F-test to find UECLs

I have fixed the link to the video "Removing Y outliers from the validation set" and it´s time to see what could be the next step to the function. As we know the RMSEP is the sum of the explained (BIAS) and unexplained error (SEP). We get also the SEP...

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Example 9.34: Bland-Altman type plot

June 5, 2012
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Example 9.34: Bland-Altman type plot

The Bland-Altman plot is a visual aid for assessing differences between two ways of measuring something. For example, one might compare two scales this way, or two devices for measuring particulate matter. The plot simply displays the difference between the measures against their average. Rather than a statistical test, it is intended...

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NBA Playoff Predictions Update 3 (4-2)

June 5, 2012
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NBA Playoff Predictions Update 3 (4-2)

This is my third update to my original post on predicting the NBA playoffs with an algorithm. Here are updates 1 and 2. The algorithm correctly predicted a Boston win, but missed on the Spurs/Thunder game, so it is currently 4-2. Haven't had any time...

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Digitize linear and (semi-)log scale graphs with multiple point sets

June 5, 2012
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Digitize linear and (semi-)log scale graphs with multiple point sets

Working on a paper, I ran into the problem of needing data from a graph that was not mine, and for which no underlying table was published. With today's software packages, it is however not very difficult to digitize a figure yourself. I remembered rea...

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Announcing Revolution R Enterprise 6.0

June 5, 2012
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Revolution Analytics is proud to announce the latest update to our enhanced, production-grade distribution of R, Revolution R Enterprise. This update expands the range of supported computation platforms, adds new Big Data predictive models, and updates to the latest stable release of open source R (2.14.2), which improves performance of the R interpreter by about 30%. This release expands...

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