Hi,

I have this plotting problem in lattice and appreciate any comments.

Say, I want to plot observed drug concentrations in point and prediction in
line

xyplot(CONC~TIME,data=df1,
panel=function(x,y,...){
  panel.xyplot(x,y,type='p',col='blue')
  PRED=df1$PRED
  panel.xyplot(x,PRED,type='l',col='red',lwd=2)
}
)

This is working fine. Now I want to make the plot conditional on some
variable "TRT". It didn't work. I guess this is because the two panel.xyplot
functions have different "y", CONC and PRED.  Only CONC is conditional on
TRT but not PRED.  df1 is a data frame with elements TIME, CONC, PRED,....
Appreciate any comments.

xyplot(CONC~TIME|*TRT*,data=df1,
panel=function(x,y,...){
  panel.xyplot(x,y,type='p',col='blue')
  PRED=df1$PRED
  panel.xyplot(x,PRED,type='l',col='red',lwd=2)
}
)
-- 
Jun Shen PhD
PK/PD Scientist
BioPharma Services
Millipore Corporation
15 Research Park Dr.
St Charles, MO 63304
Direct: 636-720-1589

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