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Re: st: mlowess- Rescaling the Y-axis


From   Nick Cox <njcoxstata@gmail.com>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: mlowess- Rescaling the Y-axis
Date   Fri, 14 Sep 2012 22:41:10 +0100

I don't know why that is surprising; it's exactly what would be expected from the documentation for -twoway lowess-. -mlowess- (SSC) is a different beast and I think you would need to do what I recommended, namely copy and edit the code. I've not tried it myself.

Nick

On 14 Sep 2012, at 19:23, "Vahid Ravaghi, Dr" <vahid.ravaghi@mcgill.ca> wrote:

Thanks for your response Nick. Can you please be more specific? For the lowess, to my surprise, adding 'twoway' to the command (.twoway lowess var1 var2) removed all points, depicted only the smooth curve, and enabled rescaling the y-axis. It does not seem to be working for the mlowess though.

Vahid



-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner- statalist@hsphsun2.harvard.edu] On Behalf Of Nick Cox
Sent: 14 September 2012 01:07
To: statalist@hsphsun2.harvard.edu
Subject: Re: st: mlowess- Rescaling the Y-axis

-mlowess- (SSC) is user-written, as you are asked to explain.

To get what you want you would need to clone -mlowess- and remove all the graphics calls except those drawing the predicted values given the predictors.

If they are essentially flat w.r.t. the predictors the modelling or smoothing exercise is evidently finding little structure in the data.

Nick


On 13 Sep 2012, at 20:26, "Vahid Ravaghi, Dr"
<vahid.ravaghi@mcgill.ca> wrote:

Hi Statalist

I am trying to depict the Lowess smoothing with multiple predictors
using the command 'mlowess'. Because I only needed the smoothed curve,
I added the 'nopt' option to get rid of the scatterplot. This was the
code:

.mlowess teeth income, nopt

The curve lie below the value 2 of the y-axis, but the y-axis ranges
from 0-25. As a result, the curve looks really small and it is hard to
interpret. Changing the range of the y-axis using the' yscale'
and 'ylable' is not feasible due to wide range of observations. I was
wondering if anyone have any suggestion to enlarge the curve either by
changing the scale of the y-axis  or etc..

Kind regards,

Vahid Ravaghi
Postdoctoral Fellow
McGill University



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