r - Adding abline to augPred plot -

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apologies basic question, new r.

i looking read off augpred plot in order average out values provide prediction between time period.

> head(tthm.groupeddata) grouped data: tthm ~ yearmon | wsz_code   wsz_code treatment_code year month tthm cl2_free    bro3 colour  ph  turb  yearmon 1        2              3 1996     1 30.7     0.35 0.00030   0.75 7.4 0.055 jan 1996 2        6              1 1996     2 24.8     0.25 0.00055   0.75 6.9 0.200 feb 1996 3        7              4 1996     2 60.4     0.05 0.00055   0.75 7.1 0.055 feb 1996 4        7              4 1996     2 58.1     0.15      na   0.75 7.5 0.055 feb 1996   5        7              4 1996     3 62.2     0.20      na   2.00 7.6 0.055 mar 1996 6        5              2 1996     3 40.3     0.15 0.00140   2.00 7.7 0.055 mar 1996

this model: 

modellme<- lme(tthm ~ yearmon, random = ~ 1|wsz_code, data=tthm.groupeddata)

and current plot:

plot(augpred(modellme, order.groups=t),xlab="date", ylab="tthm concentration", main="tthm concentration time water supply zones")

i way read off graph either placing lines between specific time period in specific wsz_code (my group) , averaging values between period...

of course other way/help or guidance appreciated!

thanks in advance

i don't think can tell whether "entirely incorrect", since have not described question , have not included data. (the plotting question close being entirely incorrect, though.) can tell answer not use abline, since augpred objects plotted plot.augpred returns (and plots) lattice object. abline base graphic function , not share coordinate system lattice device. lattice objects lists can modified. plot had different panels @ different levels of wsz_code, location of desired lines entirely unclear since trail off ellipsis. refer "times" there no "times" variable.

there lattice functions such trellis.focus , update.trellis allow 1 apply modifications lattice objects. first assign plot object named variable, make mods , plot() again.

help(package='lattice') ?lattice

(if rush job, might better off making calculations hand , using imagemagick edit pdf or png output.)


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