The DO Loop
Statistical programming in SAS with an emphasis on SAS/IML programs
SAS procedures automatically generate many graphs when you turn on ODS graphics. For example, I have written about how to interpret the graphs that are produced automatically when you use PROC PRINCOMP to perform a principal component analysis (PCA). The built-in graphs are well-designed and informative, but this article discusses
Good old Scotch drink! Inspire me, until I lisp and wink, To sing your name! -- Robert Burns (1785) Scotch whisky (spelled without an 'e') is a popular drink that makes up a multi-billion dollar industry. Scotch whisky accounts for almost 75% of Scotland's food and drink exports! Poets
When you implement a numerical algorithm, it is helpful to write tests for which the answer is known analytically. Because I work in computational statistics, I am always looking for test matrices that are symmetric and positive definite because those matrices can be used as covariance matrices. I have previously