Ready for some fun facts? These tidbits were all shared during the Western Users of SAS Software (WUSS) conference held in San Francisco this week: 1. How many million dollars did a simple Excel spreadsheet error cost TransAlta? Answer: $24 million 2. What percentage of mobile phone users older
English
WUSS 2011: By the numbers
Friday's Innovation Inspiration - Cloning
There are days that I could use code like this to make two of myself. No, that would never work; then I would be bored with so much time on my hands! In this new series, called Friday's Innovation Inspiration, we'll take a look at Post-It Notes from the 2011 Innovation Walls. SAS users filled
Optimizing? Two hints for specifying derivatives
I previously wrote about using SAS/IML for nonlinear optimization, and demonstrated optimization by maximizing a likelihood function. Many well-known optimization algorithms require derivative information during the optimization, including the conjugate gradient method (implemented in the NLPCG subroutine) and the Newton-Raphson method (implemented in the NLPNRA method). You should specify analytic