# Monthly Archives: January 2013

## Demonstrating Confidence Intervals with Shiny

January 6, 2013
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For the introductory statistic student confidence intervals can seem a daunting concept to grasp.  Quite simply put it is an interval that we have a certain measure of confidence that the population parameter falls into.  The 95% confidence is the most common value chosen in my academic circle.  Nevertheless, many others may be viable as well as long as...

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## http://cran.r-project.org/web/packages/Lambda4/index.html

January 6, 2013
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http://cran.r-project.org/web/packages/Lambda4/index.html: Our own JackStat (Tyler) published his first package in R.

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## http://cran.r-project.org/web/packages/Lambda4/index.html

January 6, 2013
By

http://cran.r-project.org/web/packages/Lambda4/index.html: Our own JackStat (Tyler) published his first package in R.

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## Batch forecasting in R

January 6, 2013
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I sometimes get asked about forecasting many time series automatically. Here is a recent email, for example: I have looked but cannot find any info on generating forecasts on multiple data sets in sequence. I have been using analysis services for sql server to generate fitted time series but it is too much of a black box (or I...

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## tRanscribing music from audio files

January 6, 2013
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While working on one of my side projects, I realized that if I want to work with audio inputs, I may need to do a little bit of audio processing. Last time I did some work with signal processing I … Continue reading →

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## Search and replace: Are you tired of nested ifelse?

January 6, 2013
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It happens all the time: you have a vector of fruits and you want to replace all bananas with apples, all oranges with pineapples, and leave all the other fruits as-is, or maybe change them all to figs. The usual solution? A big old nested ifelse: ...

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## Demonstrate your R code with an interactive, embeddable Javascript widget

January 6, 2013
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Let visitors execute and play with simple R examples right on your web page, thanks to a web service and an embeddable widget provided by the Sage project.

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## 2012 Summary and 2013 Plans

January 6, 2013
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2012 was a very important year for me. It was my first full year of trading only pure quantitative strategies. It was a very successful year as well, despite the fact that the S&P 500 returned 16% (including dividends) – a tough to beat benchmark. The strategy I use on the SPY, for which I

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## Bayesian Classification with Gaussian Process

January 6, 2013
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Despite prowess of the support vector machine, it is not specifically designed to extract features relevant to the prediction. For example, in network intrusion detection, we need to learn relevant network statistics for the network defense. In consu...

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## More Principal Components Fun

January 6, 2013
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Today, I want to continue with the Principal Components theme and show how the Principal Component Analysis can be used to build portfolios that are not correlated to the market. Most of the content for this post is based on the excellent article, “Using PCA for spread trading” by Jev Kuznetsov. Let’s start by loading

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