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st: Can -bootstrap- handle vectors


From   Alex Olssen <alex.olssen@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Can -bootstrap- handle vectors
Date   Sat, 13 Aug 2011 20:40:20 +1200

Hi Statalisters,

It seems to me that -bootstrap- cannot handle vectors?  Is this
correct?  If so, does anyone know if there is a way to use a loop to
send each element of a Mata vector to a separate Stata local so I can
bootstrap the vector element by element?

Sample code is below.  All help greatly appreciated!

************************************************************
capture program drop my_vector
program define my_vector, rclass
	syntax varlist
	mata: m_my_vector("`varlist'")
	return list
	return add
end

capture mata mata drop m_my_vector()
mata:
void m_my_vector(string scalar varlist)
{
	real matrix data, data_cov
	st_view(data, ., varlist)
	data_cov = variance(data)
	st_matrix("r(v1)", data_cov[., 1])
	st_numscalar("r(v11)", data_cov[1, 1])
}
end

sysuse auto, clear
my_vector price length weight
di r(v11)
matrix list r(v1)

bootstrap r(v11), reps(200) seed(13082011): my_vector price length weight
bootstrap r(v1), reps(200) seed(13082011): my_vector price length weight
************************************************************

Cheers,
Alex Olssen
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