小石头工作室 . Stone Studio .

Staying abreast of the world’s economy is vital, whether or not you have hefty investments in the stock market. A close study of economics sheds light on political, social, and even environmental trends, all of which affect even the average person’s daily life. Following is a list of the top 100 blogs dealing with economics. [...]

Have a Website? Blog? Webpage?  Wondering how much you website is worth? Take a deep breath, go directly to the links below and have it GRADED!
How Much is Your Blog Worth ? – Inspired by Tristan Louis’s research into the value of each link to Weblogs Inc, I’ve created this little applet using Technorati’s API [...]

Think faster than “How to write a book in 28 days”. With the freely available R language you can create a book in less than 28 seconds. Unfortunately, you still have to write the text and do the programming. What you can do is integrate the R code and text into the same files, then [...]

I was reading this blog post on Revolutions Computing’s blog and discovered the vcasmo service, a way to post a presentation or video with the slides right next to it. This is DEFINITELY something I will use. Often times I watch talks or presentation videos online and most of the time the videos are either focused on [...]

To achieve this goal, we need use the concept of literate programming, yet another one of Donald Knuth’s contributions to the world. LP “represents a move away from writing programs in the manner and order imposed by the computer, and instead enables programmers to develop programs in the order demanded by the logic and flow [...]

LaTeXSearch, a free service provided by Springer, affords the scientific community the ability to search for LaTeX code within scientific publications. LaTeXSearch allows users to locate and view the following:

Equations containing specific LaTeX code.
Equations containing LaTeX code that is similar to another LaTeX string.
All equations belonging to a specific DOI.
All equations belonging to an article [...]

Online Books
Statistics with R by Vincent Zoonekynd, 2007
  It covers 1. Introduction to R 2. Programming in R 3. From Data to Graphics 4. Customizing graphics 5. Factorial methods: Around Principal Component Analysis (PCA) 6. Clustering 7. Probability Distributions 8. Estimators and Statistical Tests 9. Regression 10. Other regressions 11. Regression Problems — and their [...]

When doing math or numerical analysis, the knowledge of the technique is far too often tied to the tool performing the calculation.  Consider an engineer whose understanding of the Fast Fourier transformation is inseparably tied to the fft function in Matlab.  Of course this hypothetical engineer understands what the results mean (more or less) but [...]