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RE: st: Tobit graphics


From   "Kakouros, Nikolaos" <Nikolaos.Kakouros@umassmemorial.org>
To   "'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu>
Subject   RE: st: Tobit graphics
Date   Thu, 27 Dec 2012 13:57:49 +0000

Trust me, Dr Cox. For me to get this to work, quite a bit of luck would be needed.
Your recommendation worked, though.

I used 
marginsplot, recast(line) recastci(rarea) addplot( (scatter x y) (lfictci x2 y2) (scatter x2 y2))

and it worked great!

Many thanks - 

Nikos

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Nick Cox
Sent: Thursday, December 27, 2012 8:44 AM
To: statalist@hsphsun2.harvard.edu
Subject: Re: st: Tobit graphics

Not clear why luck should be needed, but it's not necessary to specify -twoway-. Otherwise specify what kind of error message you got.

Nick

On 27 Dec 2012, at 13:21, "Kakouros, Nikolaos" <Nikolaos.Kakouros@umassmemorial.org
 > wrote:

> Ro'I,
> Many thanks - that works great!  I changed recastci(rline) to
> (rarea) to get the same shaded CI effect as lfitci.
>
> Now - is it possible to show this data on the same graph as the other 
> dataset's scatter and lfitci?
> I tried
> marginsplot, recast(line) recastci(rarea) addplot(twoway (scatter x
> y) (lfictci x2 y2) (scatter x2 y2))
>
> I also tried
> Twoway (marginsplot, recast(line) recastci(rarea) addplot(scatter x
> y)) (lfictci x2 y2) (scatter x2 y2)
>
>
> with no luck...
> Any suggestions?
>
> Many thanks,
>
> Nikos
>
> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu [mailto:owner- 
> statalist@hsphsun2.harvard.edu] On Behalf Of Ro'i Zultan
> Sent: Thursday, December 27, 2012 5:41 AM
> To: statalist@hsphsun2.harvard.edu
> Subject: Re: st: Tobit graphics
>
> Hi Nikos,
>
> I think the following should work for you:
> tobit x y, ll(0)
> margins, at(y=(0(10)100))
> marginsplot, recast(line) recastci(rline) addplot(scatter x y)
>
> With the margins parameters adjusted for your data.
>
> Cheers,
> Ro'i
>
> 2012/12/26 Kakouros, Nikolaos <Nikolaos.Kakouros@umassmemorial.org>
>>
>> Dear all,
>>
>> I have a set of data and using a twoway scatter and lfitci to show
>> graphically along with the least-squares regression line and
>> confidence intervals.
>> Another set of data, however, is heavily censored with the dependent
>> variable hitting a floor at 0 (and about a third of values actually
>> being at zero).
>> I noted the recent discussion on Tobit, chaired by Maarten Buis.
>>
>> I used tobit x y, ll(0)  for the regression but not sure how to
>> recreate the lfitci output (regression line and confidence intervals)
>> using the tobit regression info to produce the scatter graphic.
>> Any help would be appreciated.
>> With seasonal greetings,
>>
>> Nikos
>>
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