Posts Tagged ‘ Statistics ’

Since SAS 9.3, ODS Graphics was moved into Base SAS, which means the SAS/Graph license is not needed anymore to access ODS Graphics facilities. It’s definitely nice, but from customers’ point of view, it is not critical necessary: since the “minimum set of SAS system” in most SAS sessions includes the Base SAS, SAS/Stat...
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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...
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It is said in An Introduction to R, one of R official documents (Current Version: 2.15.1): There is an important difference in philosophy between S (and hence R) and the other main statistical systems. In S a statistical analysis is normally done as a series of steps, with intermediate results being stored in objects....
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Check it out: a new book on confidence intervals for proportions by Prof. Robert G. Newcombe  just recently available from CRC Press: Confidence Intervals for Proportions and Related Measures of Effect Size This book also supplies a set of Excel spreadsheets to calculating CIs, see http://www.crcpress.com/product/isbn/9781439812785 Other users may be interested on a SAS...
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A latest updated post on Freakonomics, Beware the Weasel Word “Statistical” in Statistical Significance!,  seemed to attempt to challenge frequentist statistics by Bayesian. I have no research on Bayesian and won’t jump to the debates. I’d rather to use this case to apply the Dragon’s Teeth and Fleas logic of hypothesis testing (at least...
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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...
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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...
Read more »

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...
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