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how to draw xyplot figure like figure 4.18 of MASS (4th) ?

Francisco J. Zagmutt 
I am not sure of what you really want.  Do you want one scatterplot with 
'month' in the x axis and 'md' in the y axis, with a line joining each point 
on the plot? Or you want a regression line with a diferent color for each 
group? Or do you want them in 3 separate panels?

If you want one plot and 3 different colors and smoothed lines joining each 
group you can try

d<-read.table('clipboard', header = T) #I copied your data from the 
clipboard
library(lattice)
plot(month,md, col = c('red','blue','black'), type='p')
lines(lowess(d[group=='NN',1]), col = 'red') #overlays a smoothed line to 
your points
lines(lowess(d[group=='SN',1]), col = 'blue')
lines(lowess(d[group=='TP',1]),col = 'black')

Or you can create 3 plots in one graph panel

par(mfrow = c(2, 2)) #2 by 2 plot panel.  Also try par(mfrow = c(3, 1)) and 
see if you like it better
plot(d[group=='NN','month'],d[group=='NN','md'], col = 'red', type='p') 
#plots the 'NN' points
lines(lowess(d[group=='NN',1]), col = 'red') #adds a smoothe line to the 
NN's
plot(d[group=='SN','month'],d[group=='SN','md'], col = 'blue', type='p')
lines(lowess(d[group=='SN',1]), col = 'blue')
plot(d[group=='TP','month'],d[group=='TP','md'], col = 'black', type='p')
lines(lowess(d[group=='TP',1]), col = 'black')

I see that the group 'SN' stays pretty much the same over time, 'TP' shows a 
decreasing trend over time and 'NN' shows that you almost have two separate 
groups with different responses!

Is this what you wanted to do?

Cheers

Francisco

Thread (7 messages)

Zhongming Yang how to draw xyplot figure like figure 4.18 of MASS (4th) ? Mar 16 Uwe Ligges how to draw xyplot figure like figure 4.18 of MASS (4th) ? Mar 16 Francisco J. Zagmutt how to draw xyplot figure like figure 4.18 of MASS (4th) ? Mar 16 Zhongming Yang how to draw xyplot figure like figure 4.18 of MASS (4th) ? Mar 16 Francisco J. Zagmutt how to draw xyplot figure like figure 4.18 of MASS (4th) ? Mar 16 Francisco J. Zagmutt how to draw xyplot figure like figure 4.18 of MASS (4th) ? Mar 16 Adaikalavan Ramasamy how to draw xyplot figure like figure 4.18 of MASS (4th) ? Mar 17