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st: RE: Using postfile


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Using postfile
Date   Thu, 20 May 2004 16:26:04 +0100

You can't -post- a whole matrix in this way. -post- 
is essentially to be used within a loop; each 
time round the loop you write another line -- 
another observation -- into the file. In 
[P] postfile there's an example in which 
a mean and a sd are posted. 

I am not clear how your problem differs from 
wanting a series of tables, in which 
case the easiest approach is to loop 
over variables and record the results
in a log file. 

Nick 
n.j.cox@durham.ac.uk 

> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu]On Behalf Of 
> siyama@who.int
> Sent: 20 May 2004 16:11
> To: statalist@hsphsun2.harvard.edu
> Subject: st: Using postfile
> 
> 
> I am struggling with a short programme to create a file of different
> cross-tabulations.  Here's the program and the corresponding 
> output using
> auto.dta
> 
> program hrh
> 	version 8.0
> 	tempname sim 
> 	postfile `sim' str20 matcell using results, replace
> 	tab `1' `2', matcell(matcell)
> 	post `sim' (matcell)
> 	postclose `sim'
> end
> **************************************************************
> *************
> 
> sysuse auto
> hrh rep78 fore
>     Repair |
>     Record |       Car type
>       1978 |  Domestic    Foreign |     Total
> -----------+----------------------+----------
>          1 |         2          0 |         2 
>          2 |         8          0 |         8 
>          3 |        27          3 |        30 
>          4 |         9          9 |        18 
>          5 |         2          9 |        11 
> -----------+----------------------+----------
>      Total |        48         21 |        69 
> 
> type mismatch
> post:  above message corresponds to expression 1, variable matcell
> r(109);
> 
> 
> I would greatly appreciate any help to what is going wrong!! 
> Also what must
> I add to an ado program to make a running session of stata 
> acknowledge the
> modifications I am making.
> 
> Many thanks.
> 
> Amani
> 
> 
> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Nick Cox
> Sent: 20 May 2004 16:47
> To: statalist@hsphsun2.harvard.edu
> Subject: st: RE: Re: RE: Random number seed
> 
> That's correct. I overlooked the importance of doing in it in 
> batch mode. It
> follows that you must change the seed within your do file. 
> 
> Nick
> n.j.cox@durham.ac.uk 
> 
> > -----Original Message-----
> > From: owner-statalist@hsphsun2.harvard.edu
> > [mailto:owner-statalist@hsphsun2.harvard.edu]On Behalf Of Subhankar 
> > Nayak
> > Sent: 20 May 2004 15:41
> > To: statalist@hsphsun2.harvard.edu
> > Subject: st: Re: RE: Random number seed
> > 
> > 
> > You are right.
> > Once I open stata and generate random numbers, the seed keeps on 
> > changing and it is completely randomized.
> > 
> > But since the program is long, I am running it without 
> opening stata. 
> > I am running it in the batch mode giving the command
> > 
> > stata -b do market.do
> > 
> > This program opens stata each time and hence gets the same seed and 
> > the same set of random numbers each time.
> > 
> > Thanks,
> > Subh
> > 
> > ----- Original Message -----
> > From: "Nick Cox" <n.j.cox@durham.ac.uk>
> > To: <statalist@hsphsun2.harvard.edu>
> > Sent: Thursday, May 20, 2004 10:24 AM
> > Subject: st: RE: Random number seed
> > 
> > 
> > > Your premise is false. Just because
> > > the seed remains the same does not
> > > imply identical samples (of a given size).
> > > Conversely, explicitly setting the seed to the same 
> number as before 
> > > the last call does ensure an identical sample.
> > >
> > > However, you can indeed change the seed easily.
> > >
> > > . search seed
> > >
> > > points to ways of doing this.
> > >
> > > More generally, there is a great
> > > deal of help on-line, which will
> > > save you time.
> > >
> > > Nick
> > > n.j.cox@durham.ac.uk
> > >
> > > > -----Original Message-----
> > > > From: owner-statalist@hsphsun2.harvard.edu
> > > > [mailto:owner-statalist@hsphsun2.harvard.edu]On Behalf Of
> > Subhankar
> > > > Nayak
> > > > Sent: 20 May 2004 15:16
> > > > To: statalist@hsphsun2.harvard.edu
> > > > Subject: st: Random number seed
> > > >
> > > >
> > > > Can the stata random number seed be itself randomized?
> > > >
> > > > I am running a program called "market.do" in the batch
> > mode without
> > > > invoking/opening stata. This program carries out an 
> analysis based 
> > > > on a set of 1,000 uniform random numbers it generates.
> > > >
> > > > However, since the random seed is always the same
> > everytime I run the
> > > > program in batch mode, I get the same set of 1,000 
> random numbers 
> > > > each time I run this program in batch mode. Results are 
> identical 
> > > > which defeats the purpose.
> > >
> > > *
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> > >
> > 
> > 
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> > 
> 
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