# Monthly Archives: February 2012

## Are Recessions Environmentally Beneficial?

February 1, 2012
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Description:Total energy consumption in the United States by sector.  Vertical gray lines represent periodsof recession.Data:http://www.eia.gov/totalenergy/data/annual/index.cfm#consumptionhttp://en.wikipedia.org/wiki/List_of_recessions_in_the_Uni...

## MAT886 mean excess function (and reinsurance)

February 1, 2012
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Tomorrow, in the course on extreme value, we will focus on applications. We will discuss reinsurance pricing. Consider a random variable , a threshold and define the mean excess function. This function is known in life insurance as the average ...

## "R": Looking at the Data (Gasoline) – 001

February 1, 2012
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As other softwares "R" has nice tools to look to the data before to develop the calibration.Statistics for the "Y" variable (in this case octane number) like Maximun, Minimun,..,standard deviation,...are important:> library(ChemometricsWithR)> data(gasoline)> summary(gasoline$octane) Min. 1st Qu. Median Mean 3rd Qu. Max. 83.40 85.88 87.75 87.18 88.45 89.60> sd(gasoline$octane) 1.530078And of course the Histogram:> hist(gasoline\$octane)

## Confirming SSR, SSE, and SST using matrix in R

February 1, 2012
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The codes below was done in our regression laboratory class. Here, we run first the data in SPSS, and take the ANOVA output where we can find the computed values of SSR, SSE, and SST.ANOVAb Model Sum of Squares df Mean Square F Sig. 1 Regress...

## R Training Course in the Bay Area

February 1, 2012
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An introduction to R for sofware developers and data analysts Saturday March 10th, 2012 8:30-5:00pm EBay 2161 North 1st Street San Jose, California I will be presenting a one day professional development workshop on R programming for software developers and … Continue reading →

## the birthday problem [X'idated]

February 1, 2012
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The birthday problem (i.e. looking at the distribution of the birthdates in a group of n persons, assuming a uniform distribution of the calendar dates of those birthdates) is always a source of puzzlement ! For instance, here is a recent post on Cross Validated: I have 360 friends on facebook, and, as

## RStudio Server: accessing the RStudio R IDE through your browser

February 1, 2012
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I like having all my important documents and scripts in one single place. This saves me from having to synchronize them between the different workplaces I have, and makes backupping much less of a pain. One way of achieving this… See more ›

## R is the easiest language to speak badly

February 1, 2012
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I am amazed by the number of comments I received on my recent blog entry about "by", "apply" and friends. I had started my post by pointing out that R is a language. Well indeed, I have come to the conclusion, that it is a language with lots of irregul...