Posts Tagged ‘ Statistics ’

What R Has Been Missing

October 17, 2013
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While R has more methods than any other analytics software, it has been missing a crucial feature found in most other packages. SPSS Modeler had it first, way back when they still called it Clementine. Then SAS Institute realized how crucial … Continue reading
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Community Contributors to SAS/STAT

September 18, 2013
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I suppose it is tempting, if the only tool you have is a hammer, to treat everything as if it were a nail. – Abraham Maslow, The Psychology of Science, 1966 Yes it’s true: since I have a pretty rich collection of SAS list processing macros, I’d like my list container to hold everything...
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Learn R and/or Data Management from Home October 7-11

September 11, 2013
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If you want to learn R, or improve your current R skills, join me for two workshops that I’m offering through Revolution Analytics in October. If you already know another analytics package, the workshop, Intro to R for SAS, SPSS … Continue reading
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Noninferiority Testing with SAS

August 27, 2013
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I planed to extend nonWinferiority testing to one of my statistical notes,  Equivalence Testing and TOST (Two One-Sided Test) since noninferiority test is simply half part of the equivalence test. Today I’m glad to find an even better explanation from SAS Usage Note 48616: Design and analysis of noninferiority studies You will love it...
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Confidence Intervals for Difference Between Independent Binomial Proportions: A SAS 9.4/STAT 12.3 Update

August 26, 2013
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For the computing of confidence intervals for difference between two independent binomial proportions in SAS 9.4/STAT 12.3, it’s hard to figure out exactly how many methods are available because there is no “CL=ALL” trigger in RISKDIFF option (but you can get one in BIONOMIAL option to compute the confidence intervals for binomial proportion). As...
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Confidence Intervals for Binomial Proportion: A SAS 9.4/STAT 12.3 Update

August 22, 2013
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After getting the access to SAS 9.4 alone with SAS/STAT 12.3, I first took a look at my favorite SAS statistical procedure, PROF FREQ.  Last year I had a note on confidence intervals for binomial proportion based on SAS 9.2/SAS9.3. Now it’s time to throw out some updates. 1. A new confidence limits method...
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Trends in the Analytics Job Market

August 7, 2013
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Tracking the job market for statistics, analytics, data mining and the like used to be a major undertaking. However, on November 10, 2011 the world’s largest web site for job postings, Indeed.com, released a tool that allows you to examine trends … Continue reading
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Calculate RMSE and MAE in R and SAS

July 12, 2013
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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...
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