[SciPy-User] from 50% probablity value to standard deviation

[Johannes Radinger]

Thank you for that answer,
the wiki articicle helped me alot, but I've still
some problems of understanding, probably just a
very simple thing.

My case:

50% are between -165 and +165, so my IQR=330

Calculating with the factor 1.349 gives my the SD-range of
-222.6 - +222.6 is that correct? Meaning that the SD is 222.6

In the graphic of the wikipedia-articel is shown that the IQR
is between -0.6745*SD and + 0.6745*SD...If I just try to
solve for 165/0.6745=SD results in a SD of 244.6 ...

I am not sure why, probably just a very simple mathematical problem I
don't realise ;)

Maybe you can help

Thank you
/Johannes