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reL Re: st: Fwd: e(RMSPE) in synth command


From   "Ariel Linden" <[email protected]>
To   <[email protected]>
Subject   reL Re: st: Fwd: e(RMSPE) in synth command
Date   Sat, 11 Jan 2014 11:28:52 -0500

In addition to Steve's response, the help file for -synth- provides the code
for running the placebo analysis:

Example 5 - Run placebo in space:
    . tempname resmat
        forvalues i = 1/4 {
        synth cigsale retprice cigsale(1988) cigsale(1980) cigsale(1975) ,
trunit(`i') trperiod(1989) period(1980(1)1988)
        matrix `resmat' = nullmat(`resmat') \ e(RMSPE)
        local names `"`names' `"`i'"'"'
        }
        mat colnames `resmat' = "RMSPE"
        mat rownames `resmat' = `names'
        matlist `resmat' , row("Treated Unit")

Ariel

Date: Fri, 10 Jan 2014 23:18:12 -0500
From: Steve Samuels <[email protected]>
Subject: Re: st: Fwd: e(RMSPE) in synth command

To see the formula that -synth- uses, type:

. viewource synth.ado

and search for "rms".


Steve
[email protected]

On Jan 10, 2014, at 8:40 PM, Rosanna Smart wrote:

I am using the synth package (available from
http://fmwww.bc.edu/repec/bocode/s/synth.html) in Stata. I need to calculate
both the pre-period and post-period RMSPEs in order to implement the placebo
analysis. What exactly does the synth command store as e(RMSPE)? When I
calculate the RMSPE's by hand, I never seem to get this number.


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