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From |
Maarten buis <maartenbuis@yahoo.co.uk> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: three mean and sd plots on the same graph? |

Date |
Wed, 7 Nov 2007 21:20:06 +0000 (GMT) |

--- Joseph Wagner <joseph.wagner@wright.edu> wrote: > I created box plot graph with of 3 X variables over the same Y > variable but was then asked to produce a similar graph this time using > mean (not median) and +/- 95% CI. I don't think Stata can do this > but thanks to a post by Nick three years ago, I was able to (sort of) > create these: > > egen mean = mean(cont), by(cat) > egen sd = sd(cont), by(cat) > gen upper = mean + sd > gen lower = mean - sd > > scatter mean cat || rcap upper lower cat Notice that this way you won't get a 95% confidence interval but a 68% confidence interval (assuming you have many cases (say 100+)) > . . . is the example Nick gave but how would (or could I?) do this > for three different X variables (in Nick's example I suppose it would > be 3 different 'cont' variables) on the same graph? I can do > this for two but not 3 which brings me to my next problem: > > The box plots I created earlier were each side by side for the same > value of X (rather than on top of one another) but the two -rcap- > graphs are on top of each other making it impossible to differentiate > the two lines (three would be even worse). Is there a way to > separate these lines or do I need to graph these data in another way > altogether? you can shift the axes around by adding and subtracting numbers In addition to Nick's suggestion I reccomend Newson R. Confidence intervals and p-values for delivery to the end user. The Stata Journal 2003; 3(3): 245-269. You can download a pre-publication draft from Roger's website: http://www.imperial.ac.uk/nhli/r.newson/papers.htm Hope this helps, Maarten ----------------------------------------- Maarten L. Buis Department of Social Research Methodology Vrije Universiteit Amsterdam Boelelaan 1081 1081 HV Amsterdam The Netherlands visiting address: Buitenveldertselaan 3 (Metropolitan), room Z434 +31 20 5986715 http://home.fsw.vu.nl/m.buis/ ----------------------------------------- ___________________________________________________________ Want ideas for reducing your carbon footprint? Visit Yahoo! For Good http://uk.promotions.yahoo.com/forgood/environment.html * * 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/

**References**:**st: three mean and sd plots on the same graph?***From:*Joseph Wagner <joseph.wagner@wright.edu>

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