How can I plot two cumulative distributions curve as line type in same plot

Question

I want to plot cumulative distributions curve for Weibull distribution over empirical cumulative distribution curve.

I have tried with this several times but it does not serve the way I want. Here is the command:

x<-(SIZEDIST$AVG.µm.)
x
plot(x,pweibull(x,shape=1.120662,scale=18.496778),type="l",col=4)
plot(ecdf(x),add=TRUE)

score 0 · Accepted Answer · answered Mar 16 '14 at 13:22

0

Use lines instead of plot

plot(x,pweibull(x,shape=1.120662,scale=18.496778),type="l",col=4)
lines(ecdf(x),col='red')

answered Mar 16 '14 at 13:22

Maciej

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hi. thanks for your comment. but while trying to execute the command it appears something unusual which I don't want. well the graphs are combined but the weibull cumulative curve appears as combination of plenty of polygons which is pretty unexpected. can u please update me. and also I'd like to know how can I change the appearance ecdf curve because it appears as lines studded with the points, whereas Ii want only the lines. – user2968058 Mar 16 '14 at 16:36
Could you paste reproductive example? – Maciej Mar 16 '14 at 17:51

score 0 · Answer 2 · answered Mar 16 '14 at 19:57

Like this?

set.seed(1)  # for reproducibility
# 1000 random samples from the Weibull dist
X <-rweibull(1000,shape=1.120662,scale=18.496778)
# z covers the range in X
z <- seq(min(x),max(x),length=100)
plot(z,pweibull(z,shape=1.120662,scale=18.496778),type="l",col=4, ylab="CDF")
plot(ecdf(x),add=TRUE)

How can I plot two cumulative distributions curve as line type in same plot

2 Answers2

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