SEMCDF
Name:
Type:
Purpose:
Compute the semi-circular cumulative distribution function.
Description:
The semi-circular distribution is the distribution onto one axis
of the points uniformly distributed within the unit circle. As
such, it is useful for testing 2-dimensional uniformity.
The formula for the cumulative distribution function is:
with
and r denoting the location and scale parameters,
respectively.
The case where
= 0 and
r = 1 is referred to as the standard semi-circular
distribution.
Syntax:
LET <y> = SEMCDF(<x>,<mu>,<r>)
<SUBSET/EXCEPT/FOR qualification>
where <x> is a variable, number, or parameter;
<mu> is a variable, number, or parameter that specifies
the location parameter;
<r> is a variable, number, or parameter that specifies
the scale parameter;
<y> is a variable or a parameter (depending on what
<x> is) where the computed semi-circular cdf value
is stored;
and where the <SUBSET/EXCEPT/FOR qualification> is optional.
If <mu> and <r> are omitted, they default to 0 and 1,
respectively.
Examples:
LET A = SEMCDF(0.5)
LET A = SEMCDF(0.5,0,5)
LET X2 = SEMCDF(X1)
Default:
Synonyms:
Related Commands:
SEMPDF
|
= Compute the semi-circular probability density
function.
|
SEMPPF
|
= Compute the semi-circular percent point function.
|
UNIPDF
|
= Compute the uniform probability density function.
|
UNICDF
|
= Compute the uniform cumulative distribution function.
|
UNIPPF
|
= Compute the uniform percent point function.
|
NORCDF
|
= Compute the normal cumulative distributoin function.
|
NORPDF
|
= Compute the normal probability density function.
|
NORPPF
|
= Compute the normal percent point function.
|
Reference:
Johnson and Kotz (1970), Continuous Univariate
Distributions - 2, Houghton Mifflin, (chapter 25).
Filliben (1969), Simple and Robust Linear Estimation of the
Location Parameter of a Symmetric Distribution,
unpublished Ph.d dissertation, Princeton University,
(pp. 21-44, 229-231).
Applications:
Implementation Date:
1994/4: Implemented for the standard case
2006/10: Implemented for the general case
Program:
YLIMITS 0 1
MAJOR YTIC NUMBER 6
MINOR YTIC NUMBER 1
YTIC DECIMAL 1
XLIMITS -1 1
XTIC OFFSET 0.1 0.1
TITLE AUTOMATIC
PLOT SEMCDF(X) FOR X = -1 0.01 1
Date created: 1/8/2008
Last updated: 1/8/2008
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