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From |
Jacob Wegelin <jacob.wegelin@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: RE: -twoway scatter- different colors for different observations |

Date |
Sun, 26 Apr 2009 19:20:08 -0400 |

I believe this is the same as my second example. The two separate -scatter- statements cause the sizes of the plotting circles to be recalculated for each -scatter- statement, so that the areas are no longer proportional to the sample size N. This is why I want to specify the color via a variable, analogous to the -msymbol(rep78)- example. Jake On Sun, Apr 26, 2009 at 6:58 PM, Kieran McCaul <Kieran.McCaul@uwa.edu.au> wrote: > . > > > How about: > > local f0 = "red" > local f1 = "green" > twoway (scatter mpg rep78 [fweight=N] if foreign==0, msymbol(Oh) > mcolor(`f0')) /// > (scatter mpg rep78 [fweight=N] if foreign==1, msymbol(Oh) > mcolor(`f1')) /// > , legend(off) > > > > > ______________________________________________ > Kieran McCaul MPH PhD > WA Centre for Health & Ageing (M573) > University of Western Australia > Level 6, Ainslie House > 48 Murray St > Perth 6000 > Phone: (08) 9224-2701 > Fax: (08) 9224 8009 > email: Kieran.McCaul@uwa.edu.au > http://myprofile.cos.com/mccaul > http://www.researcherid.com/rid/B-8751-2008 > ______________________________________________ > Epidemiology is so beautiful and provides such an important perspective > on human life and death, > but an incredible amount of rubbish is published. Richard Peto (2007) > > -----Original Message----- > From: owner-statalist@hsphsun2.harvard.edu > [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Jacob Wegelin > Sent: Monday, 27 April 2009 6:30 AM > To: statalist@hsphsun2.harvard.edu > Subject: st: -twoway scatter- different colors for different > observations > > The following syntax specifies a plot marker or -mlabel- that can take > on a different value at each plotting point (at each observation), > according to the value of variable specified in the -mlabel- > statement. > > clear all > sysuse auto > scatter price mpg, mlabel(rep78) m(i) mlabposition(3) > > But I would like to define a variable that specifies that certain > observations be plotted green, others red. Alternatively that certain > be plotted with color -none- and others with a visible color. How does > one do this? > > To motivate this (with an artificial example constructed to mimic a > real example): The following code plots average mpg by rep78, averaged > separately for foreign and domestic autos. Crucially, the area of the > plotting symbol is proportional to the sample size. I would like to > distinguish visually between domestic and foreign autos, though. Two > *separate* -scatter- statements (the second -twoway- command below) > don't give the desired result, because the plotting symbols are > re-scaled for each -scatter- statement. You can see this by switching > rapidly between the two exported graphs, junk1.pdf and junk2.pdf. And > an attempt to define a string variable -mycolor- which takes on values > "red" and "green", and then to specify -mcolor(mycolor)- analogously > to the -mlabel(rep78)- statement above, returns an error. > > clear all > set more on > sysuse auto > drop if rep78==. > sort foreign rep78 > collapse (mean) mpg (count) N=price, by(foreign rep78) > /* > A larger value for N will make the problem easier to see. > */ > replace N=50 in 6 > list > set scheme lean1 > twoway (scatter mpg rep78 [fweight=N], msymbol(Oh)) > graph export junk1.pdf, replace > more > twoway /// > (scatter mpg rep78 [fweight=N] if foreign==0, msymbol(Oh) > mcolor(red)) /// > (scatter mpg rep78 [fweight=N] if foreign==1, msymbol(Oh) > mcolor(green)) /// > , legend(off) > graph export junk2.pdf, replace > more > /* The following returns an error */ > gen mycolor="" > replace mycolor="red" if foreign==0 > replace mycolor="green" if foreign==1 > tabulate foreign mycolor > twoway (scatter mpg rep78 [fweight=N], msymbol(Oh) mcolor(mycolor)) > > > The [G] GRAPHICS manual under -marker_options- says that one could > define color by specifying a list of elements, as > > -mcolor( red green red)- > > but this would be clumsy and error-prone. There must be a way to use > the values of a variable, as in the -mlabel(rep78)- example? > > Thanks for any insights > > Jacob A. Wegelin > Assistant Professor > Department of Biostatistics > Virginia Commonwealth University > 730 East Broad Street Room 3006 > P. O. Box 980032 > Richmond VA 23298-0032 > U.S.A. > E-mail: jwegelin@vcu.edu > URL: http://www.people.vcu.edu/~jwegelin > * > * 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/

**Follow-Ups**:**Re: st: RE: -twoway scatter- different colors for different observations***From:*Jacob Wegelin <jacob.wegelin@gmail.com>

**References**:**st: -twoway scatter- different colors for different observations***From:*Jacob Wegelin <jacob.wegelin@gmail.com>

**st: RE: -twoway scatter- different colors for different observations***From:*"Kieran McCaul" <Kieran.McCaul@uwa.edu.au>

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