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

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

Subject |
st: RE: RE: graphing question - how to smooth lines connecting observations |

Date |
Wed, 14 Apr 2010 12:23:04 +0100 |

The reference is presumably to some feature in MS Excel. Martin has a serious point. Many on this list don't have access to other programs which list members refer to, or don't have detailed knowledge of such other programs, regardless of what individuals regard as standard or routine in their own institution or discipline. For example, many people, especially among the more active answerers of questions on this list, have little or no acquaintance with MS Office. I think I have seen graphs produced this way in student work. I don't know, and don't want to know, precisely how Excel does it. The problem is that _connecting_ the lines with a _smooth_ curve is almost always a bad idea. Unless the number of points is very small the curve will display spurious fluctuations as a result of overfitting. For what you want, -twoway mspline- is probably your simplest option in Stata. More serious smoothing can be done in many different ways. Nick n.j.cox@durham.ac.uk Martin Weiss Not all Statalisters may want to speculate on what other applications do, and your misspelling their name may further discourage answers. So the way forward for you is to spell out clearly, preferably using a dataset shipped with Stata, what you want your graph to look like/which features you dislike and want to change. Take as an example this one: ******* sysuse auto, clear gen byte number=_n tw (connected displacement number, sort) ******* Zamira S I am trying to generate a graph with smooth-looking lines connecting the observations. In excell it is an option but I am trying to avoid going back and force between excell and stata. Any suggestions would be greatly appreciated. Here is what I have: twoway (connected growth timeline, lcolor(black) lpattern(solid) lwidth(medthin) msymbol(circle) mcolor(black)), ytitle(GDP per capita growth) yline(0 2, lwidth(vvvthin) lcolor("192 192 192")) xtitle(Time) xlabel(-3(1)9) xline(-0.1 1.1 5.1, lcolor("87 87 87") lpattern(dash)) title(GDP Per Capita Growth (%)) subtitle(Constant US$) saving(growth, replace) * * 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: RE: graphing question - how to smooth lines connecting observations***From:*Zamira S <zamira_s@hotmail.com>

**References**:**st: graphing question - how to smooth lines connecting observations***From:*Zamira S <zamira_s@hotmail.com>

**st: RE: graphing question - how to smooth lines connecting observations***From:*"Martin Weiss" <martin.weiss1@gmx.de>

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