# Posts Tagged ‘ time series ’

## Lowest unemployment since 1976?

May 4, 2018
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It looks like we've finally recovered from the Great Recession, and there are even claims of record-low unemployment in several U.S. states. Of course claims like that make my data-radar go off, and I wanted to see the numbers for myself. And it's a gr...

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## Difference operators as matrices

July 24, 2017
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For a time series { y1, y2, ..., yN }, the difference operator computes the difference between two observations. The kth-order difference is the series { yk+1 - y1, ..., yN - yN-k }. In SAS, the DIF function in the DATA step computes differences between observations. The DIF function

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## Absorbing Markov chains in SAS

July 13, 2016
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Last week I showed how to represent a Markov transition matrix in the SAS/IML matrix language. I also showed how to use matrix multiplication to iterate a state vector, thereby producing a discrete-time forecast of the state of the Markov chain system. This article shows that the expected behavior of

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## Markov transition matrices in SAS/IML

July 7, 2016
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Many computations in elementary probability assume that the probability of an event is independent of previous trials. For example, if you toss a coin twice, the probability of observing "heads" on the second toss does not depend on the result of the first toss. However, there are situations in which

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## Tracking our local lake rise 20-ft above normal

March 7, 2016
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We recently had a flooding event at Jordan Lake where the water rose almost 20 feet above normal. This blog details that flooding event in both photos and graphs. If you're intrigued by weather, boats, or lakes then this blog's for you! In NC's Research Triangle Park area, there are basically two

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## How to build a customized voter registration data viewer

November 13, 2015
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With a major election coming next year, I was wondering if there have been any shifts & changes in the voters in my state.  This seems like an interesting opportunity for some data analysis, eh!?! To get you into the spirit of elections, here's an "I Voted" sticker from my friend

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## Do Italians really drink less alcohol than Americans?

May 26, 2015
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I saw an interesting graph on dadaviz.com that claimed Italians had gone from drinking twice as much as Americans in 1970, to less than Americans in recent years. The data analyst in me just had to "independently verify" this factoid ... But before I get into the technical part of this

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## Example 9.11: Employment plot

October 25, 2011
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A facebook friend posted the picture reproduced above-- it makes the case that President Obama has been a successful creator of jobs, and also paints GW Bush as a president who lost jobs. Another friend pointed out that to be fair, all of Bush's presi...

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