It is to be used in calculations which require all of the combinations
to be present.
Thank you for the help, your time is most appreciated
Karen
>>> "Martin Weiss" <[email protected]> 06/01/2010 13:08 >>>
<>
With the -zero- option present, I do not think it can be done. Just ask
Stata to tell you the # of obs on the final output (all predicated on my
assumption of three values for your variables - more would exacerbate
the problem).
*******
di 3^165
*******
Why not use -contract - w/o the option, and say that the remaining
theoretical combinations have zero frequency?
HTH
Martin
-----Original Message-----
From: Karen Wright [mailto:[email protected]]
Sent: Mittwoch, 6. Januar 2010 13:57
To: Martin Weiss
Subject: RE: st: AW: problem with -contract-
Thank you very much for the explanation. Am I therefore right in
assuming that it cannot be done? Unfortunately it is essential for
my
purposes to include the combinations for which the frequency is zero.
Karen
>>> "Martin Weiss" <[email protected]> 06/01/2010 12:43 >>>
<>
". I need to use -contract var*, zero-
which is where Stata has a problem with the number of variables."
The -zero- option is indeed the source of your troubles, but the
problem is with the # of observations, not the # of variables. In
fact,
the latter remaines (apart from the _freq variable) unchanged by
-contract-, while the former increases exponentially with every
variable
added.
Take my example code: My -irecode()- generates a categorical variable
with three values. When I set my memory to 1G, Stata is willing to let
me -contract, zero- on 14 variables, leading to a dataset of -di
%9.0fc
3^14- = 4,782,969 observations. When I add a fifteenth variable,
implying an output dataset comprising -di %12.0fc 3^15- = 14,348,907
obs, Stata refuses to carry out the command.
Note that IC is not necessarily at fault here, since the _number of
observations_ allowed for IC and SE/MP is the same: 2,147,483,647. The
binding constraint here is probably your installed memory...
HTH
Martin
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Karen
Wright
Sent: Mittwoch, 6. Januar 2010 12:29
To: [email protected]
Subject: RE: st: AW: problem with -contract-
Ah, I see where the problem occurs. I need to use -contract var*,
zero-
which is where Stata has a problem with the number of variables.
Although the end result is the same amount of variables as with
-contract-. It does not work even with -set mem- as high as the
system
will allow. Indeed running it a few times has shown that it will only
work for approx. 15 variables.
>>> "Martin Weiss" <[email protected]> 06/01/2010 10:51 >>>
<>
Forget the -help whatsnew- part of the last message. If you cannot
-update-, you cannot look at the whatsnew of the update, either.
Still,
the code in the last post should run.
HTH
Martin
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Martin
Weiss
Sent: Mittwoch, 6. Januar 2010 11:48
To: [email protected]
Subject: RE: st: AW: problem with -contract-
<>
" Currently I cannot update Stata."
We cannot help you there, but you should be able to run the code below
even with Stata 10.0, or earlier. I simply swapped -runiform()- and
-uniform()-, see -help whatsnew- for "update 11aug2008"...
*******
clear*
vers 9.2
set obs 1000
forv i=1/165{
gen var`i'=irecode(uniform(), 0, .2, .9, 1)
}
contract var*
su _freq, d
*******
HTH
Martin
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Karen
Wright
Sent: Mittwoch, 6. Januar 2010 11:25
To: [email protected]
Subject: Re: st: AW: problem with -contract-
Thank you the help is much appreciated but unfortunately I have to
delay
slightly as I am trying to obtain admin rights for my desktop from
IT!!!
Currently I cannot update Stata.
As you point out Stata should be able to handle the amount of
variables
I am talking about but I am assuming that -contract- must generate
extra
variables in calculating the frequencies?
I shall run the example code you have given me when I am able to
update
Stata and email you then if that would be alright? Apologies, I do
not
know how long this may take.
Thank you,
Karen
>>> "Martin Weiss" <[email protected]> 05/01/2010 17:52 >>>
<>
-h limits- (in Stata 10) does indicate that IC can handle 2,047
variables,
though. What happens when you run this example code?
*************
clear*
vers 10.1
set obs 1000
forv i=1/165{
gen var`i'=irecode(runiform(), 0, .2, .9, 1)
}
contract var*
su _freq, d
*************
HTH
Martin
-----Ursprüngliche Nachricht-----
Von: [email protected]
[mailto:[email protected]] Im Auftrag von Karen
Wright
Gesendet: Dienstag, 5. Januar 2010 18:32
An: [email protected]
Betreff: st: problem with -contract-
I was wondering if anyone could help with a problem i am having using
-contract-. I wish to use contract on about 165 variables at the same
time,
this would create a dataset containing 166 variables if contract
worked.
however Stata (of which I am using version 10, IC) cannot do this due
to
too many variables. Is there another way to create the frequencies I
require or to alter -contract- in some way to allow this many
variables?
Thank you,
Karen
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