In the case of t tests, a work-around is obtained
by noting that the results of
regress <response> <binary variable>
are equivalent to
ttest <response>, by(<binary variable>)
so that -outreg- or -estout- (which I think
you mean here rather than -estimates-) can then be
used.
Alternatively, a knit-it-yourself approach is
very simple:
. foreach v of var price-gear {
2. qui ttest `v', by(foreign)
3. di as txt "`v'" "{col 22}" as res %6.3f r(t) " " %5.4f r(p)
4. }
price -0.414 0.6802
mpg -3.631 0.0005
rep78 -6.016 0.0000
headroom 2.609 0.0110
trunk 3.268 0.0017
weight 6.246 0.0000
length 5.890 0.0000
turn 6.903 0.0000
displacement 6.597 0.0000
gear_ratio -8.476 0.0000
The essentials:
0. Looping over a variable list.
1. -quietly- executing your statistical command.
2. Picking up r() stuff (or indeed e() stuff) left in memory.
You can -return list- or -ereturn list- or read the manual
entry.
3. -display-ing results, with some attention to layout and
formats.
The example above is the third iteration of a real example. I
guessed lucky at r(p) and r(t) and then made changes to
the layout and formats.
At this point you may want to transfer to your text or
word processor.
Although I have mixed feelings about the program,
I note that -makematrix- from SSC gets you there
too:
. makematrix , from(r(p) r(t)) : ttest price-gear, by(foreign)
p t
price .88738723 .14215113
mpg .00008982 -4.1688344
rep78 8.313e-08 -6.0162381
headroom .00494105 2.9071556
trunk .00055112 3.6288312
weight 2.047e-09 6.9268345
length 2.461e-08 6.3182882
turn 1.721e-10 7.5259982
displacement 3.629e-09 6.7875143
gear_ratio 1.590e-12 -8.6552193
. makematrix results , from(r(p) r(t)) format(%6.3f) : ttest price-gear, by(foreign)
results[10,2]
p t
price 0.887 0.142
mpg 0.000 -4.169
rep78 0.000 -6.016
headroom 0.005 2.907
trunk 0.001 3.629
weight 0.000 6.927
length 0.000 6.318
turn 0.000 7.526
displacement 0.000 6.788
gear_ratio 0.000 -8.655
In this case, it is fortunate that 3 d.p. work fairly well for both p and
t values. But then with most statistical results 3 d.p. often work well,
although we frequently show many more places as a matter of social ritual.
Nick
[email protected]
Nishant Dass
> Is anyone aware of a command (like "outreg" or "estimates")
> that I could use to tabulate "ttest" or "median" test
> results?
>
> Although I don't think there's one, I just wanted to
> confirm.
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