Re: [R] Putting 2 breaks on Y axis
On Thu, 2007-04-12 at 13:41 -0500, Inman, Brant A. M.D. wrote: R plotting experts: I have a bivariate dataset composed of 300 (x,y) continuous datapoints. 297 of these points are located within the y range of [0,10], while 2 are located at 20 and one at 55. No coding errors, real outliers. When plotting these data with a scatterplot, I obviously have a problem. If I plot the full dataset with ylim = c(0,55), then I cannot see the structure in the data in the [0, 10] range. If I truncate the y axis with ylim = c(0,10), then I cannot see the 3 outliers. If I break the y axis from 10 to 20 (using plotrix functions), I still do not see the data optimally because of the white space from y=20 to y=55. What I would like to do is break the y axis at 2 points, roughly 10-20 and 20-55. Is there a function that can break an axis in 2 places? Thanks in advance for any suggestions. Brant Brant, I am not a particular fan of broken axes (though others will disagree), much less two breaks. Presuming that your data might look something like this: http://www.itl.nist.gov/div898/handbook/eda/section3/scattera.htm A couple of thoughts: 1. Not being sure if your data range above actually includes 0, you may want to consider a log scaled axis, if not. 2. I might be tempted to use two plots: A. A first a plot of the entire data set, showing the 3 outliers B. A second plot of the 297 pairs with axes constrained to the appropriate ranges to enable better visualization of the data structure. If number 2 is more appropriate, you could also use par(mfcol) to set up side by side plots. See ?par. HTH, Marc Schwartz __ [EMAIL PROTECTED] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Putting 2 breaks on Y axis
On 4/12/07, Marc Schwartz [EMAIL PROTECTED] wrote: On Thu, 2007-04-12 at 13:41 -0500, Inman, Brant A. M.D. wrote: R plotting experts: I have a bivariate dataset composed of 300 (x,y) continuous datapoints. 297 of these points are located within the y range of [0,10], while 2 are located at 20 and one at 55. No coding errors, real outliers. When plotting these data with a scatterplot, I obviously have a problem. If I plot the full dataset with ylim = c(0,55), then I cannot see the structure in the data in the [0, 10] range. If I truncate the y axis with ylim = c(0,10), then I cannot see the 3 outliers. If I break the y axis from 10 to 20 (using plotrix functions), I still do not see the data optimally because of the white space from y=20 to y=55. What I would like to do is break the y axis at 2 points, roughly 10-20 and 20-55. Is there a function that can break an axis in 2 places? Thanks in advance for any suggestions. Brant Brant, I am not a particular fan of broken axes (though others will disagree), much less two breaks. Presuming that your data might look something like this: http://www.itl.nist.gov/div898/handbook/eda/section3/scattera.htm A couple of thoughts: 1. Not being sure if your data range above actually includes 0, you may want to consider a log scaled axis, if not. 2. I might be tempted to use two plots: A. A first a plot of the entire data set, showing the 3 outliers B. A second plot of the 297 pairs with axes constrained to the appropriate ranges to enable better visualization of the data structure. If number 2 is more appropriate, you could also use par(mfcol) to set up side by side plots. See ?par. HTH, Marc Schwartz I was thinking plot the data without the outliers and include a smaller inscribed plot in a corner showing all the data (the global view). But I couldn't figure out how to do this. (I think legend() works very hard to do this type of thing.) Stephen __ [EMAIL PROTECTED] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Putting 2 breaks on Y axis
Try something like this (modify to how you like it): x - runif(100) y - rnorm(100, 5, 2) y[1:3] - c(19, 21, 50) layout(matrix( 3:1, ncol=1 ), heights=c(2,3,4)) par(mar=c(5,4,0,2)+0.1) plot(x,y, ylim=c(0,10), ylab='') par(mar=c(0.5,4,0,2)+0.1) plot(x,y, ylim=c(18,22), xlab='', xaxt='n' ) axis(1, labels=FALSE) par(mar=c(0.5,4,4,2)+0.1) plot(x,y, ylim=c(49,51),xlab='', main='my title', xaxt='n', ylab='' ) axis(1, labels=FALSE) -- Gregory (Greg) L. Snow Ph.D. Statistical Data Center Intermountain Healthcare [EMAIL PROTECTED] (801) 408-8111 -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Inman, Brant A. M.D. Sent: Thursday, April 12, 2007 12:41 PM To: [EMAIL PROTECTED] Subject: [R] Putting 2 breaks on Y axis R plotting experts: I have a bivariate dataset composed of 300 (x,y) continuous datapoints. 297 of these points are located within the y range of [0,10], while 2 are located at 20 and one at 55. No coding errors, real outliers. When plotting these data with a scatterplot, I obviously have a problem. If I plot the full dataset with ylim = c(0,55), then I cannot see the structure in the data in the [0, 10] range. If I truncate the y axis with ylim = c(0,10), then I cannot see the 3 outliers. If I break the y axis from 10 to 20 (using plotrix functions), I still do not see the data optimally because of the white space from y=20 to y=55. What I would like to do is break the y axis at 2 points, roughly 10-20 and 20-55. Is there a function that can break an axis in 2 places? Thanks in advance for any suggestions. Brant __ [EMAIL PROTECTED] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ [EMAIL PROTECTED] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Putting 2 breaks on Y axis
Inman, Brant A. M.D. wrote: R plotting experts: I have a bivariate dataset composed of 300 (x,y) continuous datapoints. 297 of these points are located within the y range of [0,10], while 2 are located at 20 and one at 55. No coding errors, real outliers. When plotting these data with a scatterplot, I obviously have a problem. If I plot the full dataset with ylim = c(0,55), then I cannot see the structure in the data in the [0, 10] range. If I truncate the y axis with ylim = c(0,10), then I cannot see the 3 outliers. If I break the y axis from 10 to 20 (using plotrix functions), I still do not see the data optimally because of the white space from y=20 to y=55. What I would like to do is break the y axis at 2 points, roughly 10-20 and 20-55. Is there a function that can break an axis in 2 places? Hi Brant, gap.plot in the plotrix package can do one break, and it is possible to do two, as gap.boxplot does. It wouldn't be too difficult to recode gap.plot to get more than one break. I'll see what I can do today. Jim __ [EMAIL PROTECTED] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Putting 2 breaks on Y axis
-Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Stephen Weigand Sent: Thursday, April 12, 2007 2:32 PM To: Inman, Brant A. M.D. Cc: [EMAIL PROTECTED] Subject: Re: [R] Putting 2 breaks on Y axis [snip] I was thinking plot the data without the outliers and include a smaller inscribed plot in a corner showing all the data (the global view). But I couldn't figure out how to do this. (I think legend() works very hard to do this type of thing.) This is fairly easy to do with the subplot function in the TeachingDemos package: Stephen -- Gregory (Greg) L. Snow Ph.D. Statistical Data Center Intermountain Healthcare [EMAIL PROTECTED] (801) 408-8111 __ [EMAIL PROTECTED] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
