Blog Archives

Opel Corsa Diesel Usage

June 24, 2013
By
Opel Corsa Diesel Usage

I wanted to extend my car weight distribution calculation of June 16 from only 2000 to years 2000 to 2013. Unfortunately, come Sunday afternoon the code seemed too slow and not even the beginning of a post. So, I went on to another calculation I w...

Read more »

Distribution of car weights

June 16, 2013
By
Distribution of car weights

Two weeks ago I described car data, among which weight distribution of cars in Netherlands. At that time it was purely plots. In the mean time I decided I wanted to model trends. As a first step of that, I decided to fit distributions for these da...

Read more »

Cars in Netherlands

June 2, 2013
By
Cars in Netherlands

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 lar...

Read more »

More bubble sort tuning

May 26, 2013
By

After last week's post bubble sort tuning I got an email from Berend Hasselman noting that my 'best' function did not protect against cases n<=2 and a speed improvement was possible. That made me realize that I should have been profiling t...

Read more »

Bubble sort tuning

May 18, 2013
By

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
By

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 »

Simulation shows gain of clmm over ANOVA is small

May 5, 2013
By
Simulation shows gain of clmm over ANOVA is small

After last post's setting up for a simulation, it is now time to look how the models compare. To my disappointment with my simple simulations of assessors behavior the gain is minimal. Unfortunately, the simulation took much more time than I ...

Read more »

Ordinal data, models with observers

April 21, 2013
By

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
By
Continuing Sync

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
By
Sync

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 »