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Re: st: Tobit graphics


From   Nick Cox <[email protected]>
To   "[email protected]" <[email protected]>
Subject   Re: st: Tobit graphics
Date   Thu, 27 Dec 2012 13:44:20 +0000

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" <[email protected] > 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: [email protected] [mailto:owner- [email protected]] On Behalf Of Ro'i Zultan
Sent: Thursday, December 27, 2012 5:41 AM
To: [email protected]
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 <[email protected]>

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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