Blog Archives

Truncated Poisson distributions in R and Stan by @ellis2013nz

March 19, 2018
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Truncated Poisson distributions in R and Stan by @ellis2013nz

Data that’s been only partially observed I’ve been updating my skills in fitting models to truncated data and was pleased to find that, like so much else in statistics, it’s easier than it used to be. First, some definitions: censored data ...

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Do tweeps with more followers follow tweeps with more followers? by @ellis2013nz

February 23, 2018
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Do tweeps with more followers follow tweeps with more followers? by @ellis2013nz

Branko Milanovic asked on Twitter: Idea for a paper: “Homogamy” on Twitter. Do people with more followers follow people with more followers? I don’t have time to write a paper but I was sufficiently interested to want to blog about it. Th...

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Books I liked in 2017 by @ellis2013nz

February 16, 2018
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Books I liked in 2017 by @ellis2013nz

I last blogged about books in September 2016 and it’s still in my 10 most popular posts. I thought I’d update it with some of the data-relevant books I read in 2017. Mostly these are books that were published before 2017 - it’s just that it was...

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Visualising an ethnicity statistical classification by @ellis2013nz

February 9, 2018
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Official statistical classifications can be big, complex things. For example, the complete version of the “International Standard Industrial Classification of All Economic Activities, Rev.4” comes as either a 300 page PDF or a 1.3GB Microsoft Acce...

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Average spend, activities and length of visit in the NZ International Visitor Survey by @ellis2013nz

February 2, 2018
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Average spend, activities and length of visit in the NZ International Visitor Survey by @ellis2013nz

A puzzle In my last blog post, I gave a hypothetical test exercise for candidates in a recruitment process, involving the International Visitor Survey (IVS) from the Ministry of Business, Innovation and Employment (MBIE). I once managed the team resp...

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How to recruit data analysts for the public sector by @ellis2013nz

January 22, 2018
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How to recruit data analysts for the public sector by @ellis2013nz

A management challenge Between 2011 and 2017 I selected somewhere between 20 and 30 staff and contractors, for New Zealand public sector roles with titles like Analyst, Senior Analyst and Principal Analyst. Alternative names for these roles could h...

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Some quirks with R and SQL Server by @ellis2013nz

December 8, 2017
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I’ve been writing on this blog less frequently in the past few months. Mostly this is because I’ve been working on a very intensive and engaging professional project that is much more hands-on (ie coding) than I’ve been at work for a while. So ...

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Seasonality of plagues by @ellis2013nz

November 18, 2017
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Seasonality of plagues by @ellis2013nz

Seasonality of plague deaths In the course of my ramblings through history, I recently came across Mark R. Welford and Brian H. Bossak Validation of Inverse Seasonal Peak Mortality in Medieval Plagues, Including the Black Death, in Comparison to Moder...

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New Zealand fatal traffic crashes by @ellis2013nz

October 14, 2017
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New Zealand fatal traffic crashes by @ellis2013nz

Traffic fatalities in the news Fatalities from traffic crashes have been in the news in New Zealand recently, for tragic reasons. For once, data beyond the short term have come into the debate. Sam Warburton has written two good articles on the topi...

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New Zealand 2017 election results by @ellis2013nz

October 6, 2017
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New Zealand 2017 election results by @ellis2013nz

Election results are in The New Zealand Electoral Commission have released the final count of votes and seats from the 2017 election. Moving in the direction most sensible observers expected, the National Party lost two seats compared to the “on-th...

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