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…
Tag: SAS
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." […]
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, […]
NOTE: New Ways in Means
There aren’t many SAS programmers who haven’t used PROC MEANS (or its alter ego PROC SUMMARY) to aggregate (summarise) their data. PROC MEANS is a familiar tool for most SAS programmers, and the process of subsequently selecting specific values of _TYP…
NOTE: True Self-Service BI With Futrix
Over the last couple of weeks I’ve featured a couple of 3rd-party SAS-related products (Metacoda security plug-ins and Phil Holland’s Ebook/apps). I’ve said how much I support 3rd-party products. So, I couldn’t let this unintentional mini-series end …
NOTE: Celebrates Its Third Birthday
It seems a lot longer, yet today is just NOTE:’s 3rd birthday*. In that time we’ve published over 300 posts and received over 80,000 page views.
Around 400 people subscribe to our RSS feed, and 200 subscribe to our email feed. We have nearly 150 Twi…