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From |
"Martin Weiss" <martin.weiss1@gmx.de> |

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

Subject |
AW: AW: st: Re: graph question |

Date |
Mon, 20 Apr 2009 10:31:13 +0200 |

<> Not sure whether it is possible with a bar chart, and I cannot find an example of what you want in the Mitchell book cited earlier, but here is a useful representation of your data: ************* clear* qui{ //create data set obs 600 gen arm= cond(_n<301,0,1) lab def arms 0 "control" 1 "experimental" la val arm arms egen float interval = fill(0 1 3 6 9 12 0 1 3 6 9 12) egen float measurement = seq(), from(1) to(50) block(6) //fictional value of measurement (no systematic diff btw control and experimental group) gen mymeasurement=rnormal() } //check mean mymeasurement, over(arm interval) //collapse collapse (mean) mean=mymeasurement (semean) semean=mymeasurement, by(arm interval) gen lb= mean-invnormal(0.975)*semean gen ub= mean+invnormal(0.975)*semean //graph graph dot (asis) mean lb ub, over(arm) over(interval) /// marker(2, mcolor(dkorange)) marker(3, mcolor(dkorange)) /// note(95 % Confidence Intervals) legend(order(1 "Mean of Measurement") rows(1)) ************* HTH Martin -----Ursprüngliche Nachricht----- Von: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Nikolaos Pandis Gesendet: Montag, 20. April 2009 10:03 An: statalist@hsphsun2.harvard.edu Betreff: Re: AW: st: Re: graph question Dear martin, Thank you for the super fast response. I see what you mean about question2 Regarding the bars I was thinking that the ci vertical line would be extended above and below the horizontal edge of the bar representing the mean. I think we see those kind of plots in excel, using the sd. Best wishes, Nick --- On Mon, 4/20/09, Martin Weiss <martin.weiss1@gmx.de> wrote: From: Martin Weiss <martin.weiss1@gmx.de> Subject: AW: st: Re: graph question To: statalist@hsphsun2.harvard.edu Date: Monday, April 20, 2009, 10:30 AM <> For the second question, change the last line to ************* //graph twoway (rcap lb ub interval, sort) (connected mean interval), /// xlabel(0 1 3 6 9 12) by(arm, note("") legend(off)) ************* What do you imagine for the first question? The range bars would overlap, and it would be hard to distinguish between them. Just try ******* //graph twoway (rcap lb ub interval, sort) (scatter mean interval), /// xlabel(0 1 3 6 9 12) ******* Sometimes you can -jitter- data points on a graph to make them more readable, but I cannot find this option for -rcap-. Mitchell http://www.stata-press.com/books/vgsg.html describes the same graph type but is apparently not bothered by the overlap. As for the bar chart, what do you want it to look like? How can you represent the CI on a bar chart? HTH Martin -----Ursprüngliche Nachricht----- Von: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Nikolaos Pandis Gesendet: Montag, 20. April 2009 08:39 An: statalist@hsphsun2.harvard.edu Betreff: Re: st: Re: graph question Dear Martin, This was more complicated to follow, and I just have to go over the details to see the exact sequence. I was wondering if you would comment on the following: - Would it be possible to have only one graph instead of two separate panels of the same graph? This way the two interventions would be next to each other within the same interval -How could I connect the means with a line? -Would it be possible to draw one bar chart with the same information? Thank you very much. Best wishes, Nick --- On Sun, 4/19/09, Martin Weiss <martin.weiss1@gmx.de> wrote: From: Martin Weiss <martin.weiss1@gmx.de> Subject: st: Re: graph question To: statalist@hsphsun2.harvard.edu Date: Sunday, April 19, 2009, 8:35 PM <> With CIs :-) *** clear* qui{ //create data set obs 600 gen arm= cond(_n<301,0,1) lab def arms 0 "control" 1 "experimental" la val arm arms egen float interval = fill(0 1 3 6 9 12 0 1 3 6 9 12) egen float measurement = seq(), from(1) to(50) block(6) //fictional value of measurement (no systematic diff btw control and experimental group) gen mymeasurement=rnormal() } //check mean mymeasurement, over(arm interval) //collapse collapse (mean) mean=mymeasurement (semean) semean=mymeasurement, by(arm interval) gen lb= mean-invnormal(0.975)*semean gen ub= mean+invnormal(0.975)*semean //graph twoway (rcap lb ub interval, sort) (scatter mean interval), /// xlabel(0 1 3 6 9 12) by(, legend(off)) by(arm, note("")) **** HTH Martin _______________________ ----- Original Message ----- From: "Nikolaos Pandis" <npandis@yahoo.com> To: <statalist@hsphsun2.harvard.edu> Cc: <npandis@yahoo.com> Sent: Sunday, April 19, 2009 6:19 PM Subject: st: graph question > Hi to all. > > I would like to ask the following: > > I have continuous data for two trial arms (control and experiment). > There are 50 measurements per arm. > Data is collected at 6 time intervals. > > I would like to plot a bar chart with the x axis showing the intervals (0, 1, 3, 6, 9, 12 months). Within each interval I would like to have one bar for the control and one for the experimental group. > The y axis shows the mean of the measurement of interest. > > Additionally, I would like to show the confidence intervals at each interval per treatment group. > > Alternatively, I would like to draw a line plot with the same y and x axis information, except that the two lines would represent the control and the experimental groups. > > Thank you very much, > > Nick > > > > * > * 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/ * * 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/

**References**:**Re: AW: st: Re: graph question***From:*Nikolaos Pandis <npandis@yahoo.com>

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