[SciPy-user] probability tools in scipy

Robert Kern robert.kern@gmail....
Tue Mar 6 15:40:05 CST 2007

Thomas Nelson wrote:
> I'm looking for a function something like:
> normalcdf(lo,hi,mu,sigma)
> that returns the probability that
> lo < X < hi
> where X is a normal random variable with mean = mu and standard deviation 
> = sigma.  Is there something like this, or a tool to make something like 
> this, in scipy?  I looked at the scipy.stats.distributions module, but as 
> far as I can tell that seems to be more of a random number generator.  Am 
> I correct about this?  does scipy have something like the functionality 
> I'm looking for?

from scipy import stats

stats.norm.cdf(hi, mu, sigma) - stats.norm.cdf(lo, mu, sigma)

Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
 that is made terrible by our own mad attempt to interpret it as though it had
 an underlying truth."
  -- Umberto Eco

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