Not long ago, I was interviewed for the Data Science Phil podcast. I had prepared excitedly with three subjects for discussion: the German tank problem, capture-mark-recapture, and the Fermi problem. These are methods to estimate population sizes from very scarce data. They can be used in diverse settings, including business intelligence.
Data Science Phil is Philipp Packmohr‘s alias for his podcast. In it, he covers subjects from data analysis, mathematical modelling and statistics. He interviews students and professors, and asks them to talk about their projects and areas of expertise.
We have been discussing it with a colleague how it would be possible to automatically detect the potholes of large road networks. Last week at the INTERGEO exhibition, I discovered three companies which offer this service. In this market survey, I summarise what I found out about them.
I returned last week from the 25th INTERGEO trade show from Stuttgart. INTERGEO combines a trade fair with a conference over three days. It claims to be the world’s largest event for geodesy, geoinformation and land management. It is held in a different city in Germany every year.
Mar de plástico, the “sea of plastic” of greenhouses around El Ejido, Almería, Spain, highlighted using my developmental Ocean Plastic Detector algorithm.
I am developing an artificial intelligence solution that detects floating plastic in the sea in freely available satellite images. As I am doing this in a voluntary capacity, if you have better financial means than I, then I encourage you to consider donating to the project. The above photo is also `for sale’ (available for licencing at a maximum resolution of 1000×1500 pixels). While I describe the technical side of the project over there, here the focus is on how we stand with plastic pollution.
Parameter estimation in a subcritical percolation model with colouring, or cross-contamination rate estimation for microfluidics
We have just published a research paper1 about a nice combination of statistics and applied probability theory. The story opens with a novel mathematical model to quantify unwanted cross-contamination within lab-on-a-chip microfluidic devices. We apply the method of simulated moments (MSM) to estimate the parameters of the model. This method uses computer simulation with many different parameter proposals until the simulated data is close enough to the observed data. Our main contribution is that we prove the statistical consistency (`correctness’) of this method. Proving that the estimate will converge with probability 1 to the true parameter value as the sample size tends to infinity was a challenge because of the dependence among our random sample’s variables.
The result of the European Commission’s Public Consultation on summertime arrangements was released today. In my opinion European Commission President Jean-Claude Juncker and German Chancellor Angela Merkel are reading too much into the non-binding and non-representative result. At this point, the realistic question to formulate would be: a) would you accept a time zone boundary splitting Western Europe as the price of ending the biannual clock changes, or b) do you prefer the current arrangement?
The European Commission held a public consultation from 4th July until 16th August (6 weeks) to find out what the European citizens and stakeholders thought about the current system of daylight saving time. I really wonder if they achieved their goal. Continue reading
Die Geschichte entfaltet sich an der Rheinischen Friedrich-Wilhelms-Universität Bonn vor meinen Augen wie ein car crash in slow motion. Sie zeigt Probleme auf, die symptomatisch für den gesamten Arbeitsmarkt im deutschen Hochschulwesen sind. Die Schwierigkeiten mit befristeten Stellen, die NachwuchsforscherInnen bewältigen müssen, um am universitären Arbeitsmarkt Fuß fassen zu können, sind hinlänglich bekannt. Die bizarren Anreize der Beteiligten führen zu langsamer Auswertung der Bewerbungen und ausgeschriebene Stellen gehen vorübergehend, aber für lange Zeitdauer, verloren.
Ich will nicht mehr schweigen. Ich habe überlegt, ob ich auf Englisch oder auf Deutsch nicht mehr schweigen soll. Ich habe mich für Deutsch entschieden, damit Entscheidungsträger (auch in der Wissenschaftspolitik) die Probematik als ihre eigene annehmen werden.
Data visualisation meets children’s curiosity. We immerse ourselves in geoinformatics to find out how postal services in the USA, in Germany and in Hungary carved their countries into mosaics of postal code areas. Visually striking maps emerge from the opaque depths of numerical data.
Whoever still sends letters by post will notice that addresses closest to you share your postal code or differ only slightly, but opposite corners of your country will have very different codes. How do postal services cover countries with postal codes?