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RE: st: RE: Exponentiating bootstrapped coefficients?


From   "Matt Spittal" <Matt.Spittal@cancervic.org.au>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: RE: Exponentiating bootstrapped coefficients?
Date   Wed, 3 Sep 2008 11:40:40 +1000

Chelsea,

The following command produces odds ratios for me (using the auto dataset).

	xi: bootstrap, reps(2000): logistic  foreign i.rep78  price weight

-- Matt
matt.spittal@cancervic.org.au  



-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu]On Behalf Of Polis, Chelsea
B.
Sent: Wednesday, 3 September 2008 11:22 AM
To: statalist@hsphsun2.harvard.edu
Subject: RE: st: RE: Exponentiating bootstrapped coefficients?


Many thanks for this suggestion, Nick.  Unfortunately, Stata is still saying that "option eform not allowed".  My results are pasted below.

Any other ideas?

Many thanks,
Chelsea

. xi: bootstrap _b, eform reps(2000) dots: logistic hc i.agecat i.educ i.sexpcat currrltn
i.agecat          _Iagecat_1-3        (naturally coded; _Iagecat_1 omitted)
i.education       _Ieducation_0-3     (naturally coded; _Ieducation_0 omitted)
i.sexpcat         _Isexpcat_0-2       (naturally coded; _Isexpcat_0 omitted)
(running logistic on estimation sample)

Bootstrap replications (2000)
----+--- 1 ---+--- 2 ---+--- 3 ---+--- 4 ---+--- 5
..................................................    50
..................................................   100
..................................................   150
.x................................................   200
..................................................   250
..................................................   300
..................................................   350
..................................................   400
..................................................   450
..................................................   500
..................................................   550
..................................................   600
..................................................   650
.............................................x....   700
...............................x..................   750
..................................................   800
.................................................x   850
................................................x.   900
..x...............................................   950
..................................................  1000
........x.........................................  1050
..x...........x...................................  1100
...................x..............................  1150
..................................................  1200
..................................................  1250
..................................................  1300
..................................................  1350
..................................................  1400
..................................................  1450
..................................................  1500
..................................................  1550
..................................................  1600
..................................................  1650
..................................................  1700
..................................................  1750
.............x....................................  1800
..................................................  1850
..................................................  1900
..................................................  1950
..................................................  2000
option eform not allowed
r(198);


On 9/2/2008 7:51 PM, Nick Cox wrote:
> Try
>
> xi: bootstrap _b, eform reps(2000) dots: logistic hc i.agecat i.educ
> i.sexpcat currrltn
>
> Nick
> n.j.cox@durham.ac.uk
>
> Polis, Chelsea B.
>
> I am doing a logistic regression (xi: logistic hc i.agecat i.educ
> i.sexpcat currrltn).  When I tried to bootstrap the data (bs "xi:
> logistic hc i.agecat i.educ i.sexpcat currrltn" _b, reps(2000) dots),
> the coefficients are not exponentiated.
>
> I tried typing "eform" after the comma (and tried using both logit and
> logistic as the main command) but STATA says "option eform not allowed"
> (even though eform does show up in the help file).  I am using STATA/SE
> 10.1 for Windows, on a computer running Vista, if that matters.  Can
> anybody tell me what I am missing here?  I know I could exponentiate
> everything by hand, but I can't imagine that people do this each time
> they bootstrap.
>
> *
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>

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