Get free disk space in SAS on Windows

This SAS macro retrieves the amount of free disk space, and puts the value in the SAS log and in a global macro variable. It works with local and remote drives and mapped and UNC paths. To avoid data loss, use it as a sanity check to verify there is a reasonable amount of disk space before writing data.

Calculate RMSE and MAE in R and SAS

Here is code to calculate RMSE and MAE in R and SAS. RMSE (root mean squared error), also called RMSD (root mean squared deviation), and MAE (mean absolute error) are both used to evaluate models. MAE gives equal weight to all errors, while RMSE gives extra weight to large errors.