We all try to write data-driven code, or code that provides some degree of flexibility regarding its input data. We see these approaches as reducing maintenance and making the code more robust. There are a number of features in the SAS language that al…
Statistical Notes (4): Dragon’s Teeth and Fleas: Hypothesis Testing in Plain English
Statisticians aren’t the problem for data science. The real problem is too many posers — Cathy O’Neil you actually do need to understand how to invert a matrix at some point in your life if you want to be a data scientist. — Cathy O’Neil I was asked in several different occasions to explain hypothesis […]
Statistical Notes (3): Confidence Intervals for Binomial Proportion Using SAS
A guy notices a bunch of targets scattered over a barn wall, and in the center of each, in the "bulls-eye," is a bullet hole. "Wow," he says to the farmer, "that’s pretty good shooting. How’d you do it?" "Oh," says the farmer, "it was easy. I painted the targets after I shot the holes." […]
Save time by creating SAS Favorites
In this SAS Add-In for Microsoft Office Tip, instructor Rob McAfee teaches how to create and manage SAS Favorites. Creating and using SAS Favorites allows you to save time by quickly navigating to the reports and analysis that you use the most. SAS F…
Statistical Notes (2): Equivalence Testing and TOST (Two One-Sided Test)
Programmers Need to Learn Statistics Or I will Kill Them All –Zed A. Shaw In an equivalence testing example against lognormal data, a TOST (Two One-Sided Test) option used in SAS TTEST procedure: proc ttest data=auc dist=lognormal tost(0.8, 1.25); paired TestAUC*RefAUC; run; And the output: Since the 90% (who not 95%? see below) limit of […]
Statistical Notes (1): Geometric Mean and Geometric Mean Ratio
Programmers Need to Learn Statistics Or I will Kill Them All –Zed A. Shaw Just read since SAS 9.2, the TTEST procedure also natively supports Equivalence Test by simply adding a TOST option (Two one-sided tests). In a example, TTEST procedure reports a geometric mean as 0.9412, which is the geometric mean of a ratio, […]