Articles by Wingfeet

Cars in Netherlands

June 2, 2013 | Wingfeet

I am looking for a new car. So when I saw there was an update on vehicles in Statistics Netherlands I just had to go and look at the data. So, I learned the brown is getting more popular, often the number of cars from a certain construction year is ... [Read more...]

Bubble sort tuning

May 18, 2013 | Wingfeet

I was reading Paul Hiemsta's blogpost on Much more efficient bubble sort in R using the Rcpp and inline packages, went back to his first post  Bubble sort implemented in pure R and thought, surely we can do it better in pure R. So I... [Read more...]

Reshaping data

May 12, 2013 | Wingfeet

Preparing and reshaping data is the ever continuing task of a data analyst. Luckily we have many tools for it. The default tool in R would be reshape(), although this is so user friendly that a reshape package has been added too. I try to use reshape()... [Read more...]

Ordinal data, models with observers

April 21, 2013 | Wingfeet

I recently made three posts regarding analysis of ordinal data. A post looking at all methods I could find in R, a post with an additional method and a post using JAGS. Common in all three was using the cheese data, a data set where... [Read more...]

Continuing Sync

April 14, 2013 | Wingfeet

I am continuing in Sync: How Order Emerges from Chaos in the Universe, Nature, and Daily Lifeby Steven Strogatz. To get a feeling on it, I was building a group of things which have only a minute influence on each other are able to synchronize thei... [Read more...]

Sync

April 7, 2013 | Wingfeet

I am listening to the audiobook Sync: How Order Emerges from Chaos in the Universe, Nature, and Daily Lifeby Steven Strogatz which I got from Audible. Obviously a mathematical book is not ideal to listen to, but lacking illustrations I can ma... [Read more...]

More ordinal data display

March 30, 2013 | Wingfeet

The past two weeks I made a post regarding analyzing ordinal data with R and JAGS. The calculations in the second part made me realize I could actually get top two box intervals out of R. This demonstrated here. For that I needed the inv... [Read more...]

Ordinal data with JAGS

March 25, 2013 | Wingfeet

Last week is had a look at the standard R routines for estimating models for ordinal data. This week, I want to have a look at JAGS for examining the same data. To be honest, most of it is taking an example (inhaler) and removing code. To my surpr... [Read more...]

Ordinal Data

March 17, 2013 | Wingfeet

I expect to be getting some ordinal data, from 5 or 9 point rating scales, pretty soon, so I am having a look ahead how to treat those. Often ANOVA is used, even though it is well known not to be ideal fro a statistical point of view, so that is the ... [Read more...]

More sequential testing for triangle tests

March 10, 2013 | Wingfeet

I looked before at triangle tests and at sequential testing in triangle tests (blog entry). In the latter post it was demonstrated that a sequential test is possible, without costs in desired error of the first kind. The latter because t... [Read more...]

Occurrence of Alzheimer deaths in Netherlands

March 3, 2013 | Wingfeet

I wanted to know a bit more about the number of people suffering from Alzheimer. It has been getting more attention and it runs in my family. From CBS (Statistics Netherlands) I pulled the data regarding the number of people dying from it. I am af... [Read more...]

Earthquakes in Netherlands

February 24, 2013 | Wingfeet

In the Netherlands we have Natural Gas. Unfortunately winning this gas seems to cause some quakes. As quakes go, they are not strong. However, our buildings are not made to resist quakes, before 1986 they were unheard of, so there is some damage. It is now predicted they could get stronger ... [Read more...]

A look at strucchange and segmented

February 17, 2013 | Wingfeet

After last week's post it was commented that strucchange and segmented would be more suitable for my purpose. I had a look at both. Strucchange can find a jump in a time series, which was what I was looking for. In contrast segmented is more suitable f... [Read more...]

Finding a jump in data

February 9, 2013 | Wingfeet

The other day I saw a plot with some data with a clear jump in it. So I wondered if it were possible to determine the position of that jump. Data with a jump is easy enough made:library(ggplot2)n [Read more...]

European Fishing

January 27, 2013 | Wingfeet

I am playing around with Eurostat data and ggplot2 a bit more. As I progress it seems the plotting gets more easy, the data pre-processing a bit more simple and the surprises on the data stay.Eurostat dataThe data used are fish_fleet (number of ships) and fish_pr (production=... [Read more...]

European Migration

January 13, 2013 | Wingfeet

Last week on the radio I heard a story of southern Europeans and Irish looking for better times in northern Europe. I heard the tale of an Italian academic who left Italy to end up waiting tables in an Italian restaurant in the Netherlands. Obviously t... [Read more...]

Sequential testing in a triangle test setting

January 6, 2013 | Wingfeet

It is well known the binomial test never has an error of exactly 5%. You aim for at most 5%, calculate the number correct to get there and end up with an error of e.g 2%. This is a shame but there is no solution. However, it is also an opportunity; the... [Read more...]
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