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From |
Kit Baum <baum@bc.edu> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
st: re: matrix command: vecdiag? |

Date |
Sun, 2 Sep 2007 21:39:15 -0400 |

Tiago's problem is that he wants to read a lot of separate data files, compute some summary statistics from each one and assemble them. He wanted to use a Stata matrix. It is much easier to use a new Stata dataset. Take auto.dta and save 5 files, each one containing the observations for rep78==1,2,3,4,5. Then

postfile ppp mu sigma str20 fn using summfile, replace

forv i=1/5 {

use rep`i',clear

qui sum price

local fn rep`i'.dta

post ppp (r(mean)) (r(sd)) ("`fn'")

}

postclose ppp

use summfile

desc

lesc

l

will produce a new Stata dataset with the desired contents: mean, std.dev. and the name of the file from which they were computed.

Kit

Kit Baum, Boston College Economics and DIW Berlin

http://ideas.repec.org/e/pba1.html

An Introduction to Modern Econometrics Using Stata:

http://www.stata-press.com/books/imeus.html

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