Test Data for the Cumulative Bivariate Normal Distribution

Using Java I implemented the double precision algorithm to compute the cumulative bivariate normal distribution found in A.Genz, “Numerical computation of rectangular bivariate and trivariate normal and t probabilities”, Statistics and Computing, 14, (3), 2004. $$M(a,b, \rho)=\frac{1}{2\pi\sqrt{1-\rho^2}}\int_{-\infty}^a\int_{-\infty}^b \exp\left(-\frac{x^2-2\rho xy +y^2}{2(1-\rho^2)}\right)dxdy$$ To validate the implementation I had hoped to find an easily accessible table of values […]

99Designs: The Good, the Bad and the Ugly

99Designs is a crowdsourcing platform for graphic designers. We were interested in a new logo for Clarus and also curious about the modern 99Designs platform, so we hosted a ‘competition’ for the design of a new logo. We chose a ‘Silver’ competition (£339),  received 219 entries from 64 different designers, and are very happy with […]