the following SPSS syntax will generate a chi distributed random
variable by taking the square root of a chi-squared random variable.
You can adapt it to your needs by changing the loop count, by changing
the df (degrees of freedom), and by changing the seed. You can save the
output in many formats, or by cut-and- paste via the clipboard if you
are on Windows.
Hope this helps.
Art
[EMAIL PROTECTED]
Social Research Consultants
University Park, MD USA
(301) 864-5570
new file.
* this program generates 2000 cases as a demo.
set seed = 20030627.
input program.
loop #i = 1 to 2000.
compute #df = 1.
compute x_chi = sqrt(rv.chisq(#df)).
end case.
end loop.
end file.
end input program.
formats
x_chi (f5.1).
execute.
IGRAPH /VIEWNAME='Histogram' /X1 = VAR(x_chi) TYPE = SCALE /Y = $count
/COORDINATE = VERTICAL /TITLE='chi distributed (sqrt chisq)'
/X1LENGTH=3.0
/YLENGTH=3.0 /X2LENGTH=3.0 /CHARTLOOK='NONE' /Histogram SHAPE = HISTOGRAM
CURVE = Off X1INTERVAL AUTO X1START = 0.
Alejandro perez wrote:
> Hi I would like to know how can I generate random numbers according to a
> chi(not chi squared).I know how to do it for a chi squared so perhaps there
> is a simple transformation of these numbers.
> Thank you all
>
>
.
.
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