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st: RE: -using- option for program executed by -simulate-

From   "Steichen, Thomas J." <[email protected]>
To   "'[email protected]'" <[email protected]>
Subject   st: RE: -using- option for program executed by -simulate-
Date   Fri, 28 Dec 2007 10:23:29 -0500


I don't know about a restriction but there is a work-a-round:

program foo, rclass
    syntax varname, using(string) diff(real) sd(real)
    drop _all
    use `"`using'"'
    tempvar y
    gen `y' = `diff'*`varlist' + (invnorm(uniform())*`sd')
    ttest `y', by(`varlist')
    ret scalar p = r(p)
local myfile "xxx.dta"
simul p = r(p), reps(100): foo group, using(`"`myfile'"') diff(1) sd(1)


Thomas J. Steichen
[email protected]

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Phil Schumm
Sent: Thursday, December 27, 2007 4:53 PM
To: [email protected]
Subject: st: -using- option for program executed by -simulate-

Often when performing simulations, it is helpful to start with an
existing dataset and then add to it, rather than having to create the
entire dataset from scratch at each iteration.  It would then seem
logical to pass the location of the saved dataset into one's program
via the -using- option.  However, for some reason, I can't seem to
get that to work (as demonstrated by this simple example):

.. input group

   1. 0
   2. 1
   3. end

.. expand 16
(30 observations created)

.. tempfile myfile

.. save `"`myfile'"'
file /tmp/S_03268.000001 saved

.. program foo, rclass
   1.     syntax varname using/, diff(real) sd(real)
   2.     drop _all
   3.     use `"`using'"'
   4.     tempvar y
   5.     gen `y' = `diff'*`varlist' + (invnorm(uniform())*`sd')
   6.     ttest `y', by(`varlist')
   7.     ret scalar p = r(p)
   8. end

.. simul p = r(p), reps(100): foo group using `"`myfile'"', diff(1) sd(1)
using not allowed

I believe this error is being thrown by -_prefix_command-, as called
from within -simulate-.  Is there a known restriction against using
the -using- option in this context?

-- Phil

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