Blog Archives

Happy PI day

March 13, 2016
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I have never done a post for PI day. This year I want to do so.So, we all know the simple estimation of PI based on random numbers. The code used here is chosen for speed in R.pi2d <- function(N=1000) {  4*sum(rowSums(matrix(runif(N*2)^2,ncol=2...

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Confidence intervals for Proportions

February 15, 2016
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Since I read documents with Clopper-Pearson a number of times the last weeks, I thought it a good idea to play around with confidence intervals for proportions a bit; to examine how intervals differ between various approaches. From a frequentist side C...

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Unemployment in Europe

February 2, 2016
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Unemployment in Europe

A couple of years I have made plots of unemployment and its change over the years. At first this was a bigger and complex piece of code. As things have progressed, the code can now become pretty concise. There are just plenty of packages to do the heav...

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A simple ANOVA

January 17, 2016
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A simple ANOVA

I was browsing Davies Design and Analysis of Industrial Experiments (second edition, 1967). Published by for ICI in times when industry did that kind of thing. It is quite an applied book. On page 107 there is an example where the variance of a process is estimated.DataData is from nine batches from which three samples were selected (A, B and...

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A plot of ‘Who works at home’

January 3, 2016
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A plot of ‘Who works at home’

I ran across this post containing displays on who works from home. I must say it looks great and is interactive but it did not help me understand the data. So I created this post to display the same data with a boring plot which might help me. For...

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Vacancies in the Netherlands

December 12, 2015
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Vacancies in the Netherlands

Over the last couple of years, each weekend I have registering how many vacancies websites claim to have. This post shows some of the observations one may draw from the plots.DataData is from general and more specialized websites. The first observation...

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Wind in Netherlands II

November 29, 2015
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Wind in Netherlands II

Two weeks ago I plotted how wind measurements on the edge of the North Sea changed in the past century. This week the same dataset is used for hypothesis testing.DataThe most important things to reiterate from previous post is that the data is from KNM...

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Wind in Netherlands

November 15, 2015
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Wind in Netherlands

In climate change discussions, everybody talks about temperature. But weather is much more than that. There is at least rain and wind as directly experienced quality, and air pressure as measurable quantity. In the Netherlands, some observation station...

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Vacancies in Europe

November 1, 2015
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Vacancies in Europe

I like playing around with data from Eurostat. At this time the tools to do so are just so easy. There are tools to pull the data directly from the data base in R (eurostat package). Process it a bit using dplyr and before you know it, ggplot makes a p...

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Trying to optimize

October 18, 2015
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I wanted to try some more machine learning. On Kaggle there is a competition How Much Did It Rain? II. This is quite a bigger data set than Titanic. To quote from Kaggle:Rainfall is highly variable across space and time, making it notoriously tricky t...

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