Re: [ccp4bb] Fwd: Re: Question about the statistical analysis-might be a bit off topic

2011-06-09 Thread Ed Pozharski
Kay, > The Wikipedia's "error propagation" article in its "Caveats > and Warnings" paragraph calls this a Cauchy distribution. And that sounds strange to me. p.d.f. of the Cauchy distribution is non-zero for any finite argument, whereas the p.d.f. for the "inverse Gaussian" must tend to zero at

[ccp4bb] Fwd: Re: Question about the statistical analysis-might be a bit off topic

2011-06-08 Thread Kay Diederichs
Dear all, just to show what I mean where the problem is: I've produced 1 million Gaussian random numbers with a mean of 1 and a standard deviation of 1. I attach a plot showing both the Gaussian itself, and the distribution of the numbers obtained by taking the inverse. The latter looks quite non-