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From |
"Nick Cox" <n.j.cox@durham.ac.uk> |

To |
<statalist@hsphsun2.harvard.edu> |

Subject |
st: RE: Overlapping variable labels |

Date |
Mon, 22 Aug 2005 18:18:10 +0100 |

I would phrase this in terms of text labels. Ulrich Kohler has written an -egen- function -gmlabvpos- using another approach to this problem, which is downloadable from SSC. Nick n.j.cox@durham.ac.uk RJ Harris > Have been having a problem of my own with the above as I'm > often getting > groups of observations clustered together. The way I thought > to deal with > this is to use the mlabvposition() option so that a variable > can be used to > set the position of the label on a clock face. > > Of course, this is rather tedious to set by hand, so the > solution I came up > with was to do a cluster analysis on the co-ordinates so they're in > sensible groups, then do some trigonometry to set the clock > positions such > that labels are spread out around each group of observations. > It doesn't > work perfectly and takes a bit of fiddling with cluster sizes > sometimes, > but might be worth a try. I don't know if anyone's had a go at this > approach before and already done a far better job, but here > is some example > code: > > > gen temp = _N/5 > recast int temp, force > replace temp = 1 if temp == 0 > local num = temp > drop temp > > cluster kmeans x y, k(`num') gen(clNo) > summ clNo > local max = r(max) > gen xx = . > gen yy = . > > forvalues i = 1/`max'{ > summ x if clNo == `i' > replace xx = x-r(mean) if clNo == `i' > summ y if clNo == `i' > replace yy = y-r(mean) if clNo == `i' > > replace xx = 1 if xx == 0 // some clusters only 1 obs > replace yy = -1 if yy == 0 > } > > gen clockVar = . > replace clockVar = 3-12*atan(yy/2*xx)/(2*_pi) if xx > 0 & yy > 0 > replace clockVar = 3-12*atan(yy/2*xx)/(2*_pi) if xx > 0 & yy < 0 > replace clockVar = 9-12*atan(yy/2*xx)/(2*_pi) if xx < 0 & yy < 0 > replace clockVar = 9-12*atan(yy/2*xx)/(2*_pi) if xx < 0 & yy > 0 > recast int clockVar, force > replace clockVar = 12 if clockVar == 0 > sort clNo clockVar > list > > scatter y x, mlabel(name) mlabvposition(clockVar) * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

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