It is a form of the bivariate normal. If x is the
distance from the aim point, then the density is
(x/s^2)exp(-x^2/(2s^2)), and s is the common
standard deviation. There is substantial data to
show that this is a reasonable description of the
pattern for small arms fire.
Shareef Siddeek wrote:
>
> What is the circular normal function? Can you give me the formula for the density
> function? Thanks. Siddeek
>
> Bob Wheeler wrote:
>
> > Data indicates that hits on a target are
> > distributed as a circular normal with parameter s.
> > Thus knowing s and the target size, one can
> > calculate the probability of a hit; however, there
> > is no theoretical function giving s as a function
> > of distance, although an inverse square law may
> > apply -- I don't know. It is also possible that
> > one could fit a curve to the probabilities as a
> > function of distance, but since the probability
> > approaches unity as the distance decreases, it
> > might be very nonlinear. At the very least you
> > will need estimates of s for several distances to
> > proceed with a calculation.
> >
> > janssen_w wrote:
> > >
> > > Hi group,
> > >
> > > I'm looking for an method to calculate the hit probabilty for the first shot
> > > fired with a rifle.
> > >
> > > From this rifle and its ammonition are measured in previous sessions a mean
> > > and a standard deviation.
> > > Also the target size and distance are know.
> > >
> > > Can anyone give me a tip (preferable in a excel sheet solution) how to
> > > obtain such a figure?
> > >
> > > With regards
> > >
> > > Wim
> >
> > --
> > Bob Wheeler --- (Reply to: [EMAIL PROTECTED])
> > ECHIP, Inc.
> >
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--
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Randomness comes in bunches
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