A brief review of R in a Nutshell by Joseph Adler. This book continues to serve as a useful reference that sits on my desk next to my computer, waiting to tell me the name of that command I've just forgotten.

A brief review of R in a Nutshell by Joseph Adler. This book continues to serve as a useful reference that sits on my desk next to my computer, waiting to tell me the name of that command I've just forgotten.

Recently, I had a professor ask me how to take a string and convert it to an R variable name on-the-fly. One possible way is: x <- 42 eval(parse(text = "x")) [1] 42 Now, suppose we want to go the other way. The trick is just as simple: x <- 42 deparse(substitute(x)) [1] "x"

Ashley put the following comment on Chapter 5 of Introducing Monte Carlo Methods with R”: I am reading chapter 5. I try to reproduced the result on page 128. The R codes don’t work on my laptop. When I try to run the following codes on page 128 > for (i in 1:(nlm(like,sta)$it)){ + mmu=rbind(mmu,nlm(like,sta,iter=i)$est)}

If you've been thinking about heading to Chicago in April for the R/Finance conference, here's another reason to go: posting for the committee, Dirk Eddelbuettel announced last week that thanks to a favourable response from sponsors, the conference organizers can now offer: a competition for best paper, which given the focus of the conference will award for both an...

I spend much of my time writing R code for simulations to compare the supervised classification methods that I have developed with similar classifiers from the literature. A large challenge is to determine which datasets (whether artificial/simulated or real) are interesting comparisons. Even if we restricted ourselves to multivariate Gaussian data, there are a large

During last two sessions (December 23th and 27th), VIX index posted returns (close to close) above 6 %. My question is – what return can we expect next day after such event? As you can see from the graph above, expected return is positive. During 1995-2010 were 53 such events and mean return was 1.02 %