The DO Loop
Statistical programming in SAS with an emphasis on SAS/IML programs
A colleague and I recently discussed how to generate random permutations without encountering duplicates. Given a set of n items, there are n! permutations My colleague wants to generate k unique permutations at random from among the total of n!. Said differently, he wants to sample without replacement from the
Sometimes it is important to ensure that a matrix has unique rows. When the data are all numeric, there is an easy way to detect (and delete!) duplicate rows in a matrix. The main idea is to subtract one row from another. Start with the first row and subtract it
When we breathe, we breathe in and breathe out. If we choose only one or the other, the results are disastrous. The same principle applies to professional growth and development. Whether we are programmers, statisticians, teachers, students, or writers, we benefit from taking in and giving back. We "take in"