Snip!t channels - Alan Dix

A comparison of some of the most common proportions show... differ. Of the proportions that are shown here, the lett... widest, and the golden section is the longest. 3 x 4 is ... of the common TV, 5 x 7 is a popular photo print format,... format (24

Cross-validation is the statistical practice of partitio... data into subsets such that the analysis is initially pe... single subset, while the other subset(s) are retained fo...
The initial subset of data is called the training set; t ...
The theory

If we define
to be a new estimator of , then the bias of is
which is less than the bias of since it eliminates the ...
where i = 1, ... n. This is the first order jackknife e ...
.

JsMath is a collection of JavaScript programs that make ... display mathematics within web pages. It works across mu... and hardware platforms, without the need for additional ... plugins on the part of the user. (It helps, however, if ... a set of ma

MathJax is an open source JavaScript display engine for ...
No more setup for readers. No more browser plugins. No m ...
LaTeX:
Jα(x)=∑m=0∞(−1)mm!Γ(m+α+1)(x2)2m+α
... (Math rendered by MathJax)

Self-Referential Aptitude Test
by Jim Propp (propp@math.mit.edu)
A few years ago I wrote a "Self-Referential Aptitude Tes ...
The solution to the puzzle is unique, and in some cases ...
... all of the above

Take about 30 paper clips, and connect them end-to-end i... Hold one end of the chain in your fingers and let the ot... Gently swing (or twirl) the chain and you should find th... "lock" in on a very specific mode shape which occurs at ...
The shapes

The Hanging Chain
The first continuous system whose normal modes were know ...

The power to understand and predict the quantities of th... be restricted to those with a freakish knack for manipul...
When most people speak of Math, what they have in mind i ...
This mechanism of math evolved for a reason: it was the ...
We are no l