Good math, bad engineering

February 17, 2017
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Good math, bad engineering


As a formal statistician and a current engineer, I feel that a successful engineering project may require both the mathematician’s ability to find the abstraction and the engineer’s ability to find the implementation.

For a typical engineering problem, the steps are usually -
- 1. Abstract the problem with a...
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Data wrangling – down the rabbit hole, and back again!

February 16, 2017
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Are your friends passing around clever memes (supposedly) featuring something your favorite actor said, or sharing news articles that you think might be "fake news"? If there's even a hint of data analyst in you, then you probably check the actual data, and confirm or disprove the supposed facts yourself. I

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Use Elasticsearch and Kibana for large BI system

February 16, 2017
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Use Elasticsearch and Kibana for large BI system



Nowadays Elasticsearch is more and more popular. Besides it original search functionalities, I found Elasticsearch can be

  1. used as a logging container. That is what the ELK stack is created for.
  2. utilized as a JSON server with richful APIs, which can be combined with its Kibana as BI...
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Simultaneous confidence intervals for multinomial proportions

February 15, 2017
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Simultaneous confidence intervals for multinomial proportions

A categorical response variable can take on k different values. If you have a random sample from a multinomial response, the sample proportions estimate the proportion of each category in the population. This article describes how to construct simultaneous confidence intervals for the proportions as described in the 1997 paper

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Learn about SAS Studio, SAS Enterprise Guide and (drumroll) SAS Viya at SAS Global Forum 2017!

February 14, 2017
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When mentioning to friends that I’m going to Orlando for SAS Global Forum 2107, they asked if I would be taking my kids. Clearly my friends have not attended a SAS Global Forum before as there have been years where I never even left the hotel! My kids would NOT enjoy it… but,

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Purging inactive voter registrations in North Carolina

February 13, 2017
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After the recent presidential election, I was updating my graphs of the voter registration data and noticed that the number of registered voters decreased after the election. At first I thought that was odd, but then I realized that maybe inactive voters were being purged. I wanted to find out

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An easy way to run thousands of regressions in SAS

February 13, 2017
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An easy way to run thousands of regressions in SAS

A common question on SAS discussion forums is how to repeat an analysis multiple times. Most programmers know that the most efficient way to analyze one model across many subsets of the data (perhaps each country or each state) is to sort the data and use a BY statement to

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Visualized: US Currency in circulation, past and present

February 9, 2017
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Visualized: US Currency in circulation, past and present

During my morning commute I heard an interesting news story on NPR's Morning Edition about the merits and risks of the $100 bill. Apparently there are a lot of them in circulation, but no one knows exactly where they are. According to the report, they are seldom used for legitimate

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Visualizing 100 years of US presidential pardons

February 9, 2017
By

A topic that's been in the news a lot lately is the presidential power to grant pardons, commutations, and such. But all the articles I've seen just quoted numeric totals - I haven't seen a graph of the data anywhere! So I set out to find the data and graph

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