commons-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Phil Steitz" <>
Subject Re: [math] normal distribution - probability mass function?
Date Sat, 26 Apr 2008 22:46:01 GMT
On Sat, Apr 26, 2008 at 3:07 PM, Will Glass-Husain <> wrote:
> Hi,
>  I'm looking to include the capability in a project to calculate both the
>  cumulative normal distribution as well as the normal probability mass
>  function.  (similar to Excel's NORMDIST function).
>  I see that NormalDistribution has a method to return the cumulative
>  probability, but does not have the probability function itself.  Can anyone
>  comment on why this missing?  (or if there's an alternative way to calculate
>  what I'm looking for?)
>  Thanks in advance,

Commons-math does not currently provide numerical estimates of
probability density functions for continuous distributions. I guess
this is because most applications need just need probabilities or
quantiles.  I am not sure how good the numerics of the definitional
formula for the normal pdf is, but you could just implement that
directly.  See, e.g.


To unsubscribe, e-mail:
For additional commands, e-mail:

View raw message