[R] basic plot() question

[Tord Snall]

Dear all,
I try to plot a logstic regression model as follows:
 
Valkror<- read.table("Valkror.txt", header=T)
np.bark<- glm(Npinc~bark, family=binomial, data=Valkror)
plot.formula(np.bark$fitted.values~ Valkror$bark)

The above looks nice but I want to connect the points with a line so I try:

plot.formula(np.bark$fitted.values~ Valkror$bark, type="b")

but it gives a somewhat! unexpected figure.     :(

Could someone please give a clue....


Sincerely,
Tord

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Tord Snäll
Avd. f växtekologi, Evolutionsbiologiskt centrum, Uppsala universitet
Dept. of Plant Ecology, Evolutionary Biology Centre, Uppsala University
Villavägen 14			
SE-752 36 Uppsala, Sweden
Tel: 018-471 28 82 (int +46 18 471 28 82) (work)
Tel: 018-25 71 33 (int +46 18 25 71 33) (home)
Fax: 018-55 34 19 (int +46 18 55 34 19) (work)
E-mail: Tord.Snall at ebc.uu.se
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