The DO Loop
Statistical programming in SAS with an emphasis on SAS/IML programs
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"
Correlation is a statistic that measures how closely two variables are related to each other. The most popular definition of correlation is the Pearson product-moment correlation, which is a measurement of the linear relationship between two variables. Many textbooks stress the linear nature of the Pearson correlation and emphasize that