Blog Archives

Paper Helicopter Experiment, part III

May 31, 2015
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Paper Helicopter Experiment, part III

As final part of my paper helicopter experiment analysis (part I, part II) I do a reanalysis for one more data set. In 2002 Erik Erhardt and Hantao Mai did an extensive experiment, see The Search for the Optimal Paper Helicopter. They did a number of s...

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Paper Helicopter experiment, part II

May 25, 2015
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Paper Helicopter experiment, part II

Last week I created a JAGS model combining data from two paper helicopter datasets. This week, I will use the model to find the longest flying one.PredictingThe JAGS/RJAGS system has no predict() function that I know of. What I therefore did is adapt t...

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The paper helicopter experiment

May 17, 2015
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The paper helicopter is one of the devices to explain about design of experiments. The aim is to create the longest flying paper helicopter by means of experimental design.Paper helicopters are a nice example, because they are cheap to make, easy to te...

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U-boats in WW-II

May 10, 2015
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U-boats in WW-II

This is the time when we celebrate the end of the second world war in The Netherlands, so I thought to do somwthig with data from that era. One of the things I enjoyed were books on the sea warfare, such as 'The Cruel Sea'by Nicholas Monsarrat. In that...

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Should I use premium Diesel? Result: No

May 2, 2015
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Should I use premium Diesel? Result: No

A while ago I had a post: 'Should I use premium Diesel? Setup. Since that time the data has been acquired. This post describes the results.DataData is registered by me in 2014 and 2015. 2014 has standard Diesel, while 2015 has premium. Both are fr...

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Unemployment of Europe in 2014 by NUTS 2 region

April 25, 2015
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Unemployment of Europe in 2014 by NUTS 2 region

During the Christmas break I worked on some code to show unemployment by NUTS 2 region. At that point no 2014 data was available. When I noticed the 214 was available I dug up the code and plotted again.Data and CodeAs written, the code was made beginn...

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PK analysis: Theoph again

April 19, 2015
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PK analysis: Theoph again

This week I wanted to repeat the Theoph PK analysis of two weeks ago in Stan. It also suddenly dawned on me. For a non-linear model in classical statistics we think it normal to provide good initializations. In contrast, for those MCMC samples I rememb...

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Cefamandole: PK after IV with six subjects in JAGS

April 12, 2015
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Cefamandole: PK after IV with six subjects in JAGS

After last week's post on Theoph I noticed the MEMSS library contained more PK data sets. The Cefamandole data is an IV data set with six subjects. It is somewhat challenging, since there seem to be several elimination rates.DataData are displayed...

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Hierarchical Two Compartimental PK Model

April 5, 2015
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In this post I am running the Theoph dataset from MEMSS (Data sets and sample analyses from Pinheiro and Bates, "Mixed-effects Models in S and S-PLUS" (Springer, 2000)) in a JAGS model. To quote the MEMSS manual:'Boeckmann, Sheiner and Beal (1994...

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Space Launch Sites over Time

March 29, 2015
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Space Launch Sites over Time

Continuing from last weeks post, I am now looking at space launch sites.DataData are from the main table. In addition, this sites table was manually browsed for interpretation of abbreviations.List of most important sitesJust by running counts the most...

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