Invisible wrote:
> Kevin Wampler wrote:
>> Invisible wrote:
>>>>> I presume it's relatively easy to work out the inverse function for 
>>>>> a normal distribution...
>>>>
>>>> Actually it's impossible to analytically compute.
>>>
>>> Define "analytically".
>>
>> As a closed-form expression.  As I said, it's still possible to 
>> compute numerically.
> 
> And Sqrt[2] erf^-1 (2z - 1) doesn't count because...?

erf isn't an elementary function.  See:

http://en.wikipedia.org/wiki/Closed-form_expression

http://en.wikipedia.org/wiki/Error_function#Taylor_series

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