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Re: st: Checking to see if the association between two variables is linear or otherwise


From   "Justina Fischer" <JAVFischer@gmx.de>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Checking to see if the association between two variables is linear or otherwise
Date   Sat, 13 Oct 2012 09:25:31 +0200

your suggestion does not resolve the problem that years sof education measure degree very inacurately.

In  A US context, 12 and 16 years of education most likely relate to high school degree and bachelor's degree attained four years later.

That Mitchel find splines at these nots suggests that using educational-level-dummies is a very good idea indeed.

Justina  

-------- Original-Nachricht --------
> Datum: Fri, 12 Oct 2012 20:25:54 -0700
> Von: William Buchanan <william@williambuchanan.net>
> An: "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
> Betreff: Re: st: Checking to see if the association between two variables is linear or otherwise

> It's one of the examples in Michael Mitchell's book on data visualization.
> He used knots at 12 and 16 years of education to illustrate how you could
> use splines and the different commands to show the different relationships
> between years of education and earnings.
> 
> - Billy
> 
> Sent from my iPhone
> 
> On Oct 12, 2012, at 20:04, "JVerkuilen (Gmail)" <jvverkuilen@gmail.com>
> wrote:
> 
> > On Fri, Oct 12, 2012 at 10:46 PM, David Kantor <kantor.d@att.net> wrote:
> > 
> >> I agree, noting that highest grade attained is better than years in
> >> education, but it is still not appropriate, as it is not an interval
> scale.
> >> The "same" increments between values do not have the same significance.
> >> For example, the significance of the increment from grade 11 to 12 is
> not
> >> the same as from 10 to 11.
> > 
> > Interesting point. I bet this could probably be ameliorated using
> > regression splines with knots at key grade milestones.
> > 
> > Jay
> > -- 
> > JVVerkuilen, PhD
> > jvverkuilen@gmail.com
> > 
> > "Out beyond ideas of wrong-doing and right-doing there is a field.
> > I'll meet you there. When the soul lies down in that grass the world
> > is too full to talk about." ---Rumi
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