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From |
David Airey <[email protected]> |

To |
[email protected] |

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

Date |
Sun, 24 Aug 2008 11:52:37 -0500 |

.

The answer is no, Stata does not weight the same way, so color and weights cannot be combined as in the R example.

-Dave

On Aug 24, 2008, at 11:37 AM, David Airey wrote:

.

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

<[email protected]> 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. * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/* * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

* * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**References**:**st: weight marker symbol fill size and color?***From:*David Airey <[email protected]>

**Re: st: weight marker symbol fill size and color?***From:*"Stas Kolenikov" <[email protected]>

**Re: st: weight marker symbol fill size and color?***From:*David Airey <[email protected]>

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