Dear Gregoire
As one who has dealt extensively with radon (but not from the
statistical world), I would appreciate it if you could post to one of
your sites either histogram in either log or some other plot. (or
your data if possible)
I have been dealing with over 50,000 data points that were collected
over a long period of time. Wisconsin is 150,000 sq km in size and
had a wide variety of geology, ranging from rock 3.0 Gigayears to
modern glaciogene material. An earlier report on the first order
evaluation of the data can be found at
http://www.mgmudrey.com/Radon/Radon.html
In particular, I would like to know the sample size, where taken,
data density, method, over what period of time the measurements were taken.
This might give me some insight into the statistical versus real
world relationships of your data.
I have noticed that most data sets are strongly asymmetric, but tend
towards a normal distribution in log space. Part of this the lower
level of detection (normally about 0.5 pCi/L (about 15 Bq/m3). This
trucation of data at the lower end is always troublesome, especially
in areas with a small dynamic range of data. In Wisconsin, USA,our
data ranges from detection to a max of about1500 Bq/m3.
MG Mudrey, Jr.
University of Wisconsin Emeritus
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