Re: st: weight marker symbol fill size and color?

[David Airey <david.airey@Vanderbilt.Edu>]

.

But if I combine this approach with weighting, would the symbol size  
be changed in the same way compared to when I weight in one scatter?  
e.g..

twoway (scatter ... if z>=9 [aw=z], ... mcolor(gs12)) (scatter ... if  
z>7.5 &
z<9 [aw=z], ... mcolor(gs8)) (scatter ... if z<7.5 [aw=z], ...  
mcolor(gs4))

vs

twoway (scatter y x [aw=z])

I'll see...Thanks.

-Dave



On Aug 24, 2008, at 11:23 AM, Stas Kolenikov wrote:


> The only way (at least that I know of) to change color is to split
> your data and do several scatterplots:
>
> twoway (scatter ... if z>=9, ... mcolor(gs12)) (scatter ... if z>7.5 &
> z<9, ... mcolor(gs8)) (scatter ... if z<7.5, ... mcolor(gs4))
>
> This can probably be automated with a ~15 line wrapper program that
> takes in z, y, z and the thresholds.
>
> Graphics in R is notably stronger than in Stata.
>
> On Sun, Aug 24, 2008 at 10:42 AM, David Airey
> <david.airey@vanderbilt.edu> wrote:
> > .
> >
> > At this page, we see how to change symbol size by using (analytic)  
> > weights:
> >
> > http://www.stata.com/support/faqs/graphics/gph/graphdocs/ 
> > scatter5.html
> >
> > e.g.,
> >
> > webuse census
> > scatter death medage [w=pop65p], msymbol(circle_hollow)
> >
> > Can we change both symbol size and color shading as in the R  
> > example below?
> >
> > -Dave
> >
> > ###------------------create the test data.frame
> > y = c(.4, 1, 2.15, 1.8, 2.7, 2.2, 1.3, .25, 1.1, .1)
> > x = c(.35, .4, .41, 1.4, 2.1, 2.25, 2.15, 2.2, 1.45, 1.3)
> > z = c(9, 7, 7.5, 7.3, 7, 7.1, 7.75, 9.5, 8, 10)
> > d = data.frame(x = x, y = y, z = z)
> >
> > d$col = gray(.5)
> > d$col[d$z>=9] = gray(.2)
> > d$col[d$z<7.5] = gray(.7)
> > #thikness = sqrt(d$y^2 + d$x^2)
> > thikness = abs(d$y) + abs(d$x)
> >
> >
> > ###----------------simple, 2-D plot
> > plot(d$x, d$y, pch=19, cex=(d$z-min(d$z)/1.5), xlim = c(-1.5,4),  
> > ylim =
> > c(-2.5,5), col=d$col)
>
>
> --
> Stas Kolenikov, also found at http://stas.kolenikov.name
> Small print: I use this email account for mailing lists only.
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