# Monthly Archives: October 2010

## R is Hot

October 6, 2010
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Our mission at Revolution Analytics is to make R the statistical analysis tool of choice in the workplace. But even though R is pervasive in academia and rising in popularity generally, we still sometimes get blank faces when we demonstrate R to potential new clients. Sure, most people have heard of R -- it's been hard to miss in...

## Belgian Astronomers and Exercise Machines

October 6, 2010
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In the twisting paths of human discovery, you never quite know what intellectual enterprise is going to result in a world changing discovery.  For instance, the mathematical notion of expected value did not grow up in a sterile, academic environment.   In 1654 Blaise Pascal was approached by Chevalier de Méré who was interested...

## Belgian Astronomers and Exercise Machines

October 6, 2010
By

In the twisting paths of human discovery, you never quite know what intellectual enterprise is going to result in a world changing discovery.  For instance, the mathematical notion of expected value did not grow up in a sterile, academic environment.   In 1654 Blaise Pascal was approached by Chevalier de Méré who was interested...

## Convert decimal to IEEE-754 in R

October 6, 2010
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For some theory on the standard IEEE-754, you can read the Wikipedia page. Here I will post only the code of the function to make the conversion in R.First we write some functions to convert decimal numbers to binary numbers:decInt_to_8bit q r xx for(i in 1:precs){xx q r xx }rr return(rr)}devDec_to_8bit nas nbs xxs for(i in 1:precs){xxs...

## Convert decimal to IEEE-754 in R

October 6, 2010
By

For some theory on the standard IEEE-754, you can read the Wikipedia page. Here I will post only the code of the function to make the conversion in R.First we write some functions to convert decimal numbers to binary numbers:decInt_to_8bit q r xx for(i in 1:precs){xx q r xx }rr return(rr)}devDec_to_8bit nas nbs xxs for(i in 1:precs){xxs...

## How fast is JAGS?

October 6, 2010
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From Martyn Plummer, on the JAGS news blog. Key graph below, showing a few outlying cases in which JAGS is substantially slower than OpenBUGS, but generally, JAGS performs quite favorably. Key point from Martyn: Incidentally, these figures are for JAGS with the glm module loaded. The glm module is not loaded by default. If you

## Typos…

October 5, 2010
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Edward Kao just sent another typo found both in  Monte Carlo Statistical Methods (Problem 3.21) and in Introducing Monte Carlo Methods with R (Exercise 3.17), namely that should be I also got another email from Jerry Sin mentioning that matrix summation in the matrix commands of Figure 1.2 of Introducing Monte Carlo Methods with R

## The Data Science Venn Diagram

October 5, 2010
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Whenever I'm asked, "Who uses R?", I usually rattle off a long list of job titles: statistician, analyst, quant, researcher ... and that's before all the domain-specific titles. It would be nice if there were a simple, succinct phrase to describe the process of working with, analyzing, and communicating with real data. At the new blog, "dataists", the inaugural...

## Example 8.8: more Hosmer and Lemeshow

October 5, 2010
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This is a special R-only entry.In Example 8.7, we showed the Hosmer and Lemeshow goodness-of-fit test. Today we demonstrate more advanced computational approaches for the test.If you write a function for your own use, it hardly matters what it looks l...

## India Australia test cricket matches over the years

October 5, 2010
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If you're like me - chewing your nails, sitting in the same position for the last 2 hours to watch India battle Australia in the Mohali test match and enjoying the fascinating duel, watch how closely these two teams have fought in the past. This plot s...