[R] How to use Lines function to draw the error bars?

Tue Oct 9 03:31:13 CEST 2012

On Oct 8, 2012, at 5:49 PM, liang.che at us.pwc.com wrote:

> one extra question
> 
> How do I export the final image (with plots and lines added) into files in 
> a batch mode for a bunch of regressions?

You probably need to review:

?Devices
 ?BATCH

-- 
David.

> 
> thanks
> 
> 
> ----- Forwarded by Liang Che/US/TLS/PwC on 10/08/2012 08:48 PM -----
> 
> From:   Liang Che/US/TLS/PwC
> To:     Joseph Clark <joeclark77 at hotmail.com>@INTL
> Cc:     r-help at r-project.org
> Date:   10/08/2012 08:44 PM
> Subject:        RE: [R] How to use Lines function to draw the error bars?
> 
> 
> thank you all for your answers
> 
> i have figured out the plot i wanted - it was actually pretty easy
> 
> lines(x=20:34,prd[,1],col="red",Ity=1)
> lines(x=20:34,prd[,2],lty=2)
> lines(x=20:34,prd[,3],lty=2)
> 
> 
> 
> 
> 
> 
> From:   Joseph Clark <joeclark77 at hotmail.com>
> To:     Liang Che/US/TLS/PwC at Americas-US
> Cc:     <r-help at r-project.org>
> Date:   10/08/2012 05:30 PM
> Subject:        RE: [R] How to use Lines function to draw the error bars?
> 
> 
> 
> I don't have any experience with "predict", but if it returns a data 
> frame, just capture that data frame and refer to the columns as vectors.
> 
> mydata <- predict(...)
> plotCI(  1:nrow(mydata), y=mydata$fit, ui=mydata$upr, li=mydata$lwr )
> 
> That seems easier to me.
> 
> 
> // joseph w. clark , visiting research associate
> \\ university of nebraska at omaha - school of IS&T
> 
> To: joeclark77 at hotmail.com
> CC: r-help at r-project.org
> Subject: RE: [R] How to use Lines function to draw the error bars?
> From: liang.che at us.pwc.com
> Date: Mon, 8 Oct 2012 17:16:12 -0400
> 
> Thanks   
> 
> since the 'lwr' and 'upr' are produced from the 'predict' function, do I 
> need to convert the table into a data frame, then define the 'lwr' and 
> 'upr' as the objects? 
> 
> upr<-data.frame(prd[,3]) 
> fix(upr) 
> lwr<-data.frame(prd[,2]) 
> fix(lwr) 
> y<-data.frame(prd[,1]) 
> fix(y) 
> plotCI(x=1:15,y=y,uiw=upr,liw=lwr,err=x) 
> 
> 
> but I got the following error message: 
> 
> Error in xy.coords(x, y, xlabel, ylabel, log) : 
>  'x' and 'y' lengths differ 
> In addition: Warning message: 
> In if (err == "y") z <- y else z <- x : 
>  the condition has length > 1 and only the first element will be used
> 
> 
> 
> 
> From:        Joseph Clark <joeclark77 at hotmail.com> 
> To:        Liang Che/US/TLS/PwC at Americas-US 
> Cc:        <r-help at r-project.org> 
> Date:        10/08/2012 05:06 PM 
> Subject:        RE: [R] How to use Lines function to draw the error bars? 
> 
> 
> 
> In my example code, 'fit' and 'upr' and 'lwr' are just the names of the 
> data vectors you gave as an example.  If those names aren't correct, 
> change them to what you're actually using.  You can also assign your x 
> values to x.
> 
> // joseph w. clark , visiting research associate
> \\ university of nebraska at omaha - school of IS&T
> 
> To: joeclark77 at hotmail.com
> CC: r-help at r-project.org
> Subject: RE: [R] How to use Lines function to draw the error bars?
> From: liang.che at us.pwc.com
> Date: Mon, 8 Oct 2012 17:00:56 -0400
> 
> thank you all 
> 
> plotCI is probably the closest to what I wanted to do -- draw the 
> Confidence Interval curves around the fitted values (fit) 
> 
> but I got the following wrong message while I tried plotCI? 
> 
> Error in plotCI(x = 1:15, y = fit, ui = upr, li = lwr) : 
> object 'upr' not found 
> 
> 
> 
> 
> 
> 
> From:        Joseph Clark <joeclark77 at hotmail.com> 
> To:        Liang Che/US/TLS/PwC at Americas-US, <r-help at r-project.org> 
> Date:        10/08/2012 04:03 PM 
> Subject:        RE: [R] How to use Lines function to draw the error bars? 
> 
> 
> 
> I typically use the function "plotCI" from the "plotrix" package for 
> confidence intervals or error bars.
> The code would be:
> 
> library(plotrix)
> plotCI( x=1:15, y=fit, ui=upr, li=lwr)
> 
> 
> // joseph w. clark , visiting research associate
> \\ university of nebraska at omaha - school of IS&T
> 
>> To: r-help at r-project.org
>> From: liang.che at us.pwc.com
>> Date: Mon, 8 Oct 2012 15:11:53 -0400
>> Subject: [R] How to use Lines function to draw the error bars?
>> 
>> fit lwr upr
>> 1 218.4332 90.51019 346.3561
>> 2 218.3906 90.46133 346.3198
>> 3 218.3906 90.46133 346.3198
>> 4 161.3982 44.85702 277.9394
>> 5 192.4450 68.39903 316.4909
>> 6 179.8056 56.49540 303.1158
>> 7 219.5406 91.52707 347.5542
>> 8 162.6761 46.65760 278.6945
>> 9 193.8506 70.59838 317.1029
>> 10 181.3816 58.11305 304.6502
>> 11 221.2871 92.14366 350.4305
>> 12 164.2947 47.91081 280.6785
>> 13 195.3415 72.04109 318.6418
>> 14 182.7447 58.68660 306.8028
>> 15 222.5223 91.86550 353.1791
>> 
>> 
>> I have tried 
>> 
>> new<-data.frame(newdata$Unemployment)
>> prd<-predict.lm(fit,newdata,interval=c("confidence"),level=0.95)
>> lines (new,prd[,3],col="red",lty=2)
>> 
>> but it didn't give me anything.
>> 
>> thanks
>> 
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> The information transmitted, including any attachments, is intended only for the person or entity to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipient is prohibited, and all liability arising therefrom is disclaimed. If you received this in error, please contact the sender and delete the material from any computer. PricewaterhouseCoopers LLP is a Delaware limited liability partnership.  This communication may come from PricewaterhouseCoopers LLP or one of its subsidiaries.
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David Winsemius, MD
Alameda, CA, USA