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Re: st: Re: requesting help for a newbie


From   "Michael Blasnik" <michael.blasnik@verizon.net>
To   <statalist@hsphsun2.harvard.edu>
Subject   Re: st: Re: requesting help for a newbie
Date   Wed, 10 Sep 2003 15:59:00 -0400

It only requires one step, but I think you mis-interpret what the
nquantiles() arguement means.  The 25 you use means 25 quantiles (each
covering 4% of the data), not 25% of the data.

You might want to try:

xtile totdolarsqtl=totdolars, nq(4)

then totdolarsqtl will contain values from 1-4 indicating which quartile of
totdolars each observation belongs to..

Michael Blasnik
michael.blasnik@verizon.net


----- Original Message ----- 
From: "Deborah L. Rhodes" <drhodes@usc.edu>
To: <statalist@hsphsun2.harvard.edu>
Sent: Wednesday, September 10, 2003 3:38 PM
Subject: Re: st: Re: requesting help for a newbie


> Thank you.   I don't have hard manuals to follow and no previous
> statistical package knowledge.  Please be patient.  As stated, I am a
newbie.
>
> My first question: Does categorizing numerical data into quartiles require
> two steps or one?   The original data(totdolars)is in dollar amounts.
>
> I have tried to go directly to the quartiles: (using both g and as noted
below)
>          xtile totdolarsqtl=totdolars, nquantiles(25);
>
> I have the same problem if I try pctile to create percentiles to bring to
> quartiles.  It seems the syntax should be similar.
>          pctile totdolarspc=totdolars, nquantiles(1);
>
> I have substituted totdolars (my variable with original dollar amount
data)
> for exp, which according to the help file for "creating variables using
> percentiles" is "typically just another variable."
>
> Thank you in advance.  DEB
> drhodes@usc.edu
>
> At 02:49 PM 9/10/2003 -0400, you wrote:
> >I would suggest that you show us ewactly what you typed if you want
specific
> >answers.
> >
> >I'm not sure what part of "varlist not allowed" is confusing you -- it
seems
> >like an informative message.  You must be using a varlist ( a list of
> >variables) with a command that doesn't accept one.  If you look at -help
> >pctile- you will see syntax information for pctile, xtile, and _pctile.
> >None of them accepts a varlist although pctile and xtile want a new
variable
> >name followed by an equals sign followed by an expression (which could be
a
> >variable name, but not a varlist).
> >
> >Hope this helps,
> >
> >Michael Blasnik
> >michael.blasnik@verizon.net
> >
> >
> >----- Original Message -----
> >From: "Deborah L. Rhodes" <drhodes@usc.edu>
> >To: <statalist@hsphsun2.harvard.edu>
> >Sent: Wednesday, September 10, 2003 2:32 PM
> >Subject: st: requesting help for a newbie
> >
> >
> > > I have searched the helpfiles with no success.
> > >
> > > I keep coming up with "varlist not allowed".  Could someone please
advise
> > > me how to fix the error, but more importantly how to get to the
meanings
> >of
> > > various "error codes" in the help files.  My searches on errors, error
> > > codes, varlist, and "varlist not allowed" proved fruitless.  I've also
> > > checked FAQ and other resources.   I'm trying to place my data values
into
> > > quartiles.  Seems to be a two step process, first set up pctiles then
> > > xtiles, but I can't get past the "varlist not allowed".  Thanks in
> > > advance.   DEB
> > >
> > > Deborah L. Rhodes
> > > student, University of Southern California
> > > (Stata 8, if it matters)
> > >
> > >
> > > *
> > > *   For searches and help try:
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> > > *   http://www.stata.com/support/statalist/faq
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> > >
> >
> >
> >*
> >*   For searches and help try:
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>
>
> *
> *   For searches and help try:
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>


*
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