How to use Lines function to draw the error bars?
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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