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

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: RE: RE: RE: how to add error bars to each data marker on a line graph (or the size of the data marker reflect the confidence interval)? |

Date |
Fri, 18 Feb 2011 18:02:15 +0000 (GMT) |

--- Xin Lu asked > I have a data set with 15 rows and four columns: x | y | > lower CI for y | upper CI for y. > > I use the line graph to illustrate my data. So I would have > 15 data markers connected by straight line segment. I need > to put error bars (confidence interval for y) at each data > point, or I could use the size of the data marker to reflect > the confidence interval. -- Zhiqiang Wang answered > Assuming that your four variables are named as x, y, low and upper, try > the following: > > . sort x > . line y x || rcap low upper x --- On Fri, 18/2/11, Liao, Junlin asked: > Interesting solution. But I fail to see that it solves > the problem, especially if the y variable is categorical. > Even if y is numeric, the chart is not meaningful, not > what Xin wanted. As far as I understand the original question, it exactly produces the graph that was asked for. It is obviously hard to describe in words how a graph should look like, so misunderstanding can easily happen. For that reason look at the graph when you run the example below in Stata (I changed Zhiqiang's -line- to -twoway connected- because Xin also asked for markers): *------------ begin example ------------- drop _all // create some data that would recreate // the main features set obs 15 gen y = rnormal() sort y gen x = _n gen lb = y - 2 gen ub = y + 2 sort x twoway connected y x || rcap lb ub x *------------- end example ------------- (For more on examples I sent to the Statalist see: http://www.maartenbuis.nl/example_faq ) Hope this clarifies the issue, Maarten -------------------------- Maarten L. Buis Institut fuer Soziologie Universitaet Tuebingen Wilhelmstrasse 36 72074 Tuebingen Germany http://www.maartenbuis.nl -------------------------- * * 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: RE: RE: RE: how to add error bars to each data marker on a line graph (or the size of the data marker reflect the confidence interval)?***From:*"Liao, Junlin" <junlin-liao@uiowa.edu>

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