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# st: RE: cell match std errors

 From "Nick Cox" <[email protected]> To <[email protected]> Subject st: RE: cell match std errors Date Thu, 5 Feb 2004 13:57:04 -0000

```Not familiar with this stuff, sorry, but I note that you are cycling
through binary representations of 0/63. There is a nice undocumented
way of doing that using -inbase-. Here is a way of getting that list:

forval i = 0/63 {
qui inbase 2 `i'
local list "`list' `r(base)'"
}

If you needed all leading zeros,

forval i = 0/63 {
qui inbase 2 `i'
local this : di %06.0f `r(base)'
local list "`list' `this'"

... just in case you wanted to move up to 0/127 0/255 etc.

So your code could be simplified to

forval i = 0/63 {
qui inbase 2 `i'
local num `r(base)'
...
}

Nick
[email protected]

Joao Pedro W. de Azevedo
>
> I've written a Stata routine to estimate an exact (cell) match average
> treatment effect as suggested by Card and Sullivan (1988). So
> far my ado
> file is only able to compute the average values of the non
> treated, the
> treated, the difference and the weighted difference (att).
>
> I would like to know if anyone could give me a suggestion on
> how I could
> compute the std errors using Stata. Below follows an example
> of the output
> and the do file that generates it.
>
> Many thanks,
>
> Joao Pedro
>
> Reference:
> Card, D. and D. G. Sullivan (1988). "Measuring the Effect of
> Subsidized
> Training Programs on Movements in and out of Employment." Econometrica
> 56(3): 497-530.
>
> foreach num in 0 1 10 11 100 101 110 111 1000 1001 1010 1011
> 1100 1101 1110
> 1111 10000 10001 10011 10101 10111 11000 11001 11010 11011
> 11100 11101 11110
> 11111 100000 100001 100010 100011 100100 100101 100110 100111
> 101000 101001
> 101011 101101 101110 101111 110000 110001 110010 110011
> 110100 110101 110110
> 110111 111000 111001 111010 111011 111100 111101 111110 111111 {

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