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st: RE: bootstrap statistic


From   "Nick Winter" <nwinter@policystudies.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: bootstrap statistic
Date   Thu, 12 Sep 2002 10:22:22 -0400

> -----Original Message-----
> From: Jun Xu [mailto:mystata@hotmail.com] 
> Sent: Thursday, September 12, 2002 10:15 AM
> To: statalist@hsphsun2.harvard.edu
> Subject: st: bootstrap statistic
> 
> 
> In bs command, Stata puts a formula in the second set of 
> quotation marks to 
> denote a statistic to bootstrap like
> 
> logit y x1 x2
> bs "logit y x1 x2" "whatever statistic formula", rep(#)
> 
> However, it's kind of strange to me that I cannot wrap up 
> lines use /* */ 
> and it seems that I cannot put space between numeric signs 
> like "_b[_cons] + 
> mean2*_b[x1] + mean3*_b[_x2]" won't work, and I have to get 
> rid of any space 
> like "_b[_cons]+mean2*_b[x1]+mean3*_b[_x2]".  Here mean2 and 
> mean3 are 
> defined as scalars.  Any input on this?  Is that because I 
> use scalar in the 
> quotation mark, or it has to be the case that no wrap-up of 
> the stuff within 
> the second set of quotation marks or the space thing.  If so, 
> might be kind 
> of inconvient if I have a long formula for a statistic to bootstrap.

The -bs- command breaks up the line of statistics with the -tokenize-
command, splitting the line on white space.  You can include spaces in
the individual statistics by enclosing them in quotation marks, and
enclosing the whole list in compound quotes:

bs "reg mpg price weight" `""_b[price] + _b[weight]" "_b[price]"
"_b[weight]""'

However, as far as I can tell you cannot break up the line of statistics
over
two lines.

Nick Winter

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