slides: delete the pres folder
This commit is contained in:
parent
1abae15070
commit
d09ae6de87
@ -1,43 +0,0 @@
|
||||
# PDF
|
||||
|
||||
The Moyal distribution is defined as:
|
||||
$$
|
||||
M(x) = \frac{1}{\sqrt{2 \pi}} e^{-\frac{1}{2} \left[ x + e^{-x} \right]}
|
||||
$$
|
||||
More generally, it is defined with the location and scale parameters $\mu$ and
|
||||
$\sigma$ such as:
|
||||
$$
|
||||
x \rightarrow \frac{x - \mu}{\sigma}
|
||||
$$
|
||||
|
||||
# CDF
|
||||
|
||||
The cumulative distribution function $\mathscr{M}(x)$ can be derived from the
|
||||
pdf $M(x)$ integrating:
|
||||
$$
|
||||
\mathscr{M}(x) = \frac{1}{\sqrt{2 \pi}} \int\limits_{- \infty}^x dy \, M(y)
|
||||
= \frac{1}{\sqrt{2 \pi}} \int\limits_{- \infty}^x dy \, e^{- \frac{1}{2}}
|
||||
e^{- \frac{1}{2} e^{-y}}
|
||||
$$
|
||||
with the change of variable:
|
||||
\begin{align}
|
||||
z = \frac{1}{\sqrt{2}} e^{-\frac{y}{2}}
|
||||
&\thus \frac{dz}{dy} = \frac{-1}{2 \sqrt{2}} e^{-\frac{y}{2}} \\
|
||||
&\thus dy = -2 \sqrt{2} e^{\frac{y}{2}} dz
|
||||
\end{align}
|
||||
hence, the limits of the integral become:
|
||||
\begin{align}
|
||||
y \rightarrow - \infty &\thus z \rightarrow + \infty \\
|
||||
y = x &\thus z = \\\frac{1}{\sqrt{2}} e^{-\frac{x}{2}} = f(x)
|
||||
\end{align}
|
||||
and the CDF can be rewritten as:
|
||||
$$
|
||||
\mathscr{M}(x) = \frac{1}{2 \pi} \int\limits_{+ \infty}^{f(x)}
|
||||
dz \, (- 2 \sqrt{2}) e^{\frac{y}{2}} e^{- \frac{y}{2}} e^{- z^2}
|
||||
= \frac{-2 \sqrt{2}}{\sqrt{2 \pi}} \int\limits_{+ \infty}^{f(x)}
|
||||
dz e^{- z^2}
|
||||
$$
|
||||
since the `erf` is defines as:
|
||||
$$
|
||||
|
||||
$$
|
@ -1,35 +0,0 @@
|
||||
The Moyal distribution, which is a steepest descent approximation of the
|
||||
Landau distribition, is defines as:
|
||||
$$
|
||||
\exp \left( - \frac{x - \mu }{2 \sigma}
|
||||
- \frac{1}{2} \exp \left( - \frac{x -\mu}{\sigma} \right) \right)
|
||||
$$
|
||||
Mean $m$ and variance $\sigma$:
|
||||
$$
|
||||
m = \mu + \sigma [ \gamma + \ln(2) ] \et \sigma = \frac{\pi^2 \sigma^2}{2}
|
||||
$$
|
||||
Median:
|
||||
$$
|
||||
\mu - \sigma \left[ 2 \text{erf}^{-1} \left( \frac{1}{2} \right)^2 \right]
|
||||
$$
|
||||
skewness and kurtosis are constant:
|
||||
$$
|
||||
s = \frac{28 \sqrt{2} Z(3)]{\pi^3} \et k = 7
|
||||
$$
|
||||
max value:
|
||||
$$
|
||||
\frac{1}{\sqrt{2 e \pi}}
|
||||
$$
|
||||
cdf:
|
||||
$$
|
||||
\text{erf} \left( \frac{\exp \left(
|
||||
- \frac{x - \mu}{2 \sigma} \right)}{\sqrt{2}} \right)
|
||||
$$
|
||||
|
||||
$\mu$ is the location parameter and $\sigma$ is the scale parameter.
|
||||
The Moyal distribution was first proposed in a 1955 paper by physicist J. E.
|
||||
Moyal. The distribution models the energy lost by a fast charged particle
|
||||
(and hence the number of ion pairs produced) during ionization. Historically,
|
||||
the Moyal distribution has been utilized in the approximation of the Landau
|
||||
Distribution and has since found use in modeling a wide array of phenomena.
|
||||
|
@ -1,8 +0,0 @@
|
||||
produrre moyal più simile possibile alla Landau e poi distinguiamole.
|
||||
renderle simili:
|
||||
stessa moda
|
||||
stessa fwhm
|
||||
stessa mediana
|
||||
poi applichiamo i quattro test che abbiamo implementato per distinguerle.
|
||||
|
||||
La Moyal è come una gaussiana
|
Loading…
Reference in New Issue
Block a user