Stratified random sample: What’s efficient?

January 23, 2017
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In a previous blog, Random Sampling: What's Efficient?, I discussed the efficiency of various techniques for selecting a simple random sample from a large SAS dataset.  PROC SURVEYSELECT easily does the job: proc surveyselect data=large out=sample method=srs /* simple random sample */ rate=.01; /* 1% sample rate */ run; Note:

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Kick off your SAS Global Forum journey with a SAS Certification

January 23, 2017
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We are a few months away from SAS Global Forum in Orlando. You might think that the conference kicks off Sunday night at opening session, but there are plenty of weekend activities before then and I’d like to highlight one of them: SAS certification exam sessions. Isn’t now a great

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Five reasons to check out the new SAS analytical documentation

January 23, 2017
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Five reasons to check out the new SAS analytical documentation

The SAS analytical documentation has a new look. Beginning with the 14.2 release of the SAS analytical products (which shipped with SAS 9.4m4 in November 2016), the HTML version of the online documentation has moved to a new framework called the Help Center. The URL for the online documentation is

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Explaining analytics? Maybe you should think about the narrative

January 20, 2017
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I continue to find the concept of explaining analytics through storytelling intriguing. As I have written before, at first blush this did not seem immediately clear to me. The advice to use storytelling appeared somewhat vague, trite and without substance. More importantly, it seemed to conflict with the rigor required

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How do teenage boys eat so much, and stay so thin?

January 20, 2017
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"They'll eat you out of house & home! Their food bill will put you in the poor house! ... And they never gain an ounce!" - That's what my friends say about their teenage sons. They're probably exaggerating a little, but since it's a recurring theme, there's probably some truth

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Where does Girl Scout cookie money go?

January 18, 2017
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Here in the US, it's Girl Scout cookie season. This is when you get to spend a few bucks on cookies, break your New Year's resolution about losing weight ... and feel good about it, because the money's going to a good cause. Or is it? - Let's break down

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Solve mixed-integer linear programming problems in SAS

January 18, 2017
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Solve mixed-integer linear programming problems in SAS

This article shows how to solve mixed-integer linear programming (MILP) problems in SAS. In a mixed-integer problem, some of the variables in the problem are integer-valued whereas others are continuous. The objective function is a linear function of the variables and the variables can be subject to linear constraints. Last

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Prius isn’t the highest-mpg hybrid in 2017!

January 16, 2017
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For many years, the Toyota Prius was the hybrid with the best mpg - but in 2017 that's changing! Let's examine the data ... For analyses like this, I have found the fueleconomy.gov website to be a wonderful source of information. In recent years, they've even made all their data

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PUT it there! Six tips for using PUT and %PUT statements in SAS

January 16, 2017
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For SAS programmers, the PUT statement in the DATA step and the %PUT macro statement are useful statements that enable you to display the values of variables and macro variables, respectively. By default, the output appears in the SAS log. This article shares a few tips that help you to

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