?panel.abline
You need grid/lattice functions for xyplot !
-- Bert
On Thu, Mar 29, 2012 at 9:38 AM, John Sorkin
<jsor...@grecc.umaryland.edu> wrote:
> I am trying to plot the results of a random effects model where each subject
> is allowed to have his, or her, own intercept. I use xyplot to plot the data,
> lme to compute the regression and then try to put a summary regression line
> on the xyplot. As can be seen by the output pasted below, I am getting an
> error message,
> Error in int_abline(a = a, b = b, h = h, v = v, untf = untf, ...) :
> (list) object cannot be coerced to type 'double'
> Any ideas what I need to change to make this work?
>
>
>
>
>> # Run random effects regression with subject specific slopes.
>> fitxx<-lme(value~time,random=~1|subject,data=repeatdata,na.action=na.omit)
>> summary(fitxx)
> Linear mixed-effects model fit by REML
> Data: repeatdata
> AIC BIC logLik
> 303.4246 309.6460 -147.7123
>
> Random effects:
> Formula: ~1 | subject
> (Intercept) Residual
> StdDev: 15.17196 9.803319
>
> Fixed effects: value ~ time
> Value Std.Error DF t-value p-value
> (Intercept) 52.79943 4.467854 21 11.817625 0.0000
> time -0.44162 0.231605 21 -1.906793 0.0703
> Correlation:
> (Intr)
> time -0.242
>
>
>
> Number of Observations: 37
> Number of Groups: 15
>>
>> # Plot data
>> xyplot(value~time,group=subject,type="b",main="Clot size vs. time.")
>> # Add summary regression line
>> abline(fitxx)
> Error in int_abline(a = a, b = b, h = h, v = v, untf = untf, ...) :
> (list) object cannot be coerced to type 'double'
>>
>>
>
> John David Sorkin M.D., Ph.D.
> Chief, Biostatistics and Informatics
> University of Maryland School of Medicine Division of Gerontology
> Baltimore VA Medical Center
> 10 North Greene Street
> GRECC (BT/18/GR)
> Baltimore, MD 21201-1524
> (Phone) 410-605-7119
> (Fax) 410-605-7913 (Please call phone number above prior to faxing)
>
> Confidentiality Statement:
> This email message, including any attachments, is for ...{{dropped:22}}
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