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AW: st: AW: Hello listers


From   "Martin Weiss" <martin.weiss1@gmx.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   AW: st: AW: Hello listers
Date   Tue, 13 Oct 2009 16:10:54 +0200

<> 

-cumul- takes given values and forms the cumulative distribution function.
These values could be distributed according to any density. -normal- gives
you the cumulative of the normal, and -normalden- gives you the density
function of the normal.

*************
clear*
set obs 10000

gen x=-5+10*runiform()

gen z=normalden(x)
cumul z, gen(cumz)

line z x, sort name(den, replace) /* 
*/ nodraw

gen y=rnormal()

cumul y, gen(cumy)

line cumy y, sort name(cumul, replace) /* 
*/ nodraw

gr combine den cumul
*************

Note the -egen, std()- function for your standardization purposes (such as
your x and z)...

HTH
Martin


-----Ursprüngliche Nachricht-----
Von: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Evans Jadotte
Gesendet: Dienstag, 13. Oktober 2009 16:01
An: statalist@hsphsun2.harvard.edu
Betreff: Re: st: AW: Hello listers

Martin Weiss wrote:
> <> 
>
> Not sure what "...cumulative standard normal distribution of a variable"
> means, but maybe this will help:
>
> *************
> tw (function normal(x), range(-5 5))
> *************
>
>
>
> HTH
> Martin
>
>
> -----Ursprüngliche Nachricht-----
> Von: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Evans Jadotte
> Gesendet: Dienstag, 13. Oktober 2009 15:20
> An: statalist@hsphsun2.harvard.edu
> Betreff: st: Hello listers
>
> Hi statalisters,
>
> I have a very simple and maybe stupid question, hope someone can help. I 
> am trying to get the correct syntax for /_normal_ /to get the  
> cumulative standard normal distribution of a variable. Any help?
>
> EJ
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>
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>   
Thanks Martin,

Sorry for not being clear on this list. What I am trying to calculate is 
, cumulative density of the standard normal or the standard normal 
density, respectively. I was trying with

cumul x, gen(y)       // x = ((z-m)/sqrt(s))

but what I am getting is not consistent. By the way, does /cumul/ do the 
same job as normal(.) or normalden(.) in Stata?

Thanks in advance,

EJ
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