Getting down and dirty with lake water quality data

April 13, 2016
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Just like my hero Mike Rowe on the Dirty Jobs TV show, I'm finally diving into an area involving water quality ... and poop! Let's take a graphical look at just how clean (or dirty) the water is, at the lake where my Raleigh Dragon Boat Club practices... Before we get

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Head-tail versus head-head: A counterintuitive property of coin tosses

April 13, 2016
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Head-tail versus head-head: A counterintuitive property of coin tosses

I saw an interesting mathematical result in Wired magazine. The original article was about mathematical research into prime numbers, but the article included the following tantalizing fact: If Alice tosses a coin until she sees a head followed by a tail, and Bob tosses a coin until he sees

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Set attributes of markers in PROC SGPLOT by using ODS style elements

April 11, 2016
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Set attributes of markers in PROC SGPLOT by using ODS style elements

The SG procedures in SAS use aesthetically pleasing default colors, shapes, and styles, but sometimes it is necessary to override the default attributes. The MARKERATTRS= option enables you to override the default colors, symbols, and sizes of markers in scatter plots and other graphs. Similarly, the LINEATTRS= option enables you

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Broadcast your SAS credentials with digital badging

April 8, 2016
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If you happen to be a SAS credential holder, like most candidates, you have invested a lot of time and effort in earning your SAS certification.  Wouldn’t it be great if you could broadcast and manage verifiable proof of your achievement where you want and when you want? That’s where

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PROC REPORT versus other base SAS procedures

April 7, 2016
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When you’re making a report, how do you choose which procedure to use?  The answer is – it depends. It depends on: whether you are doing an ad hoc analysis or creating a final report that many people will see whether you will run statistical tests with your data or

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Boaty McBoatface is on the run

April 6, 2016
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Boaty McBoatface is on the run

I know what you're thinking: two "Boaty McBoatface" articles within two weeks? And we're past April Fool's Day? But since I posted my original analysis about the "Name our ship" phenomenon that's happening in the UK right now, a new contender has appeared: Poppy-Mai. The cause of Poppy-Mai, a critically

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Generate points uniformly inside a d-dimensional ball

April 6, 2016
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Generate points uniformly inside a d-dimensional ball

Last week I showed how to generate random points uniformly inside a 2-d circular region. That article showed that the distance of a point to the circle's center cannot be distributed uniformly. Instead, you should use the square root of a uniform variate to generate 2-D distances to the origin.

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Things to do in Vegas during SAS Global Forum

April 5, 2016
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While you're at SAS Global Forum (or any conference) in Las Vegas, you might have a bit of spare time to do some sightseeing. Therefore I've put together a list & map of interesting things you might want to experience! Below is a snapshot of my map - click it

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The WHERE clause in SAS/IML

April 4, 2016
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The WHERE clause in SAS/IML

In SAS procedures, the WHERE clause is a useful way to filter observations so that the procedure receives only a subset of the data to analyze. The IML procedure supports the WHERE clause in two separate statements. On the USE statement, the WHERE clause acts as a global filter. The

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