The title of this post is maybe not correct in a mathematical sense, but I was asking myself if there exists an estimator for the “standard deviation of a standard deviation” or a kind of error bound for a sample…
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Blog Archives
Standard deviation of a standard deviation
Tagged with: Data analysis, Errors and residuals in statistics, Estimator, mathematician, Normal distribution, Sample size determination, scientist, Standard deviation, Statistics, Uncertainty
Posted in math, paper, physics, programming
Posted in math, paper, physics, programming
How to turn an ASCII table with AWK
Imagine you have a text (ASCII) file that holds a table/matrix, e.g. A1 A2 A3 A4 A5 B1 B2 B3 B4 B5 C1 C2 C3 C4 C5 but what you need, is the information transposed, i.e. A1 B1 C1 A2…
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Most traffic jams are caused by just a handful of drivers
I don’t own a car and I am of the opinion that in my current environment (Tokyo) a car is a waste of money, resources, time and nerves. I am sure there are places where you really need a car…
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Tagged with: Boston, Land transport, public transportation, Rush hour, Tokyo, Traffic congestion, traffic jam, Transport, urban planner
Posted in Japanese, paper, travel
Posted in Japanese, paper, travel
My scientific year 2012 – a review
First of all, I wish all my readers a Happy New Year. After taking off the last two weeks and returning to Austria for Christmas holidays I am back in the office today. Before really starting in 2013 it is…
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Tagged with: Academia, Papers, Peer review, Publishing, Thomson Reuters
Posted in paper, programming
Posted in paper, programming
Computing resources
The last days and weeks I did not have much time for blogging since I was busy applying for a research grant as well as doing some calculations for an upcoming meeting. For the latter task, I used quite a…
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Tagged with: Computer architecture, Parallel computing
Posted in computer, math, paper, physics, programming
Posted in computer, math, paper, physics, programming
The July Effect
When you need to go to a hospital you expect that you get the same treatment independently from the season of the year. Well, that’s basically true. However, depending on the graduation dates of the universities or the hospital’s recruiting…
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How far can Tarzan jump?
I guess you remember the Tarzan movies and that guy swinging from liana to liana. Maybe, you have asked yourself “How far can he jump when using the liana swing technique”? A Japanese researcher has tackled the problem and came…
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Google Scholar and BibTeX
Google Scholar is likely the most useful application for scientists provided by the guys from Mountain View. First of all, it is free. Similar services like the Web of Knowledge are only accessible if your institute pays for that. One…
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Online LaTex formula generator
I happens quite often that I need to insert an equation in one of my presentation slides or posters. Although either OpenOffice or Powerpoint have some way to present formulas or equations, their quality and appeal is quite poor. For…
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Karhunen-Loève Transform – an interesting alternative to FFT and wavelets
Today I stumbled over this interesting paper which describes the usage of the Karhunen-Loève Transform (KLT) for (weak) signal detection in time-series. Although there are many similarities with wavelet analysis, the KLT seems to be less computationally demanding (but its…
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Tagged with: Digital signal processing, Fast Fourier transform, Karhunen–Loève theorem, KLT, Statistics, Wavelet
Posted in computer, GPS, math, paper, programming
Posted in computer, GPS, math, paper, programming
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