leo_wa wrote:
i want to plot the histogram and the curve in the same graph.if i have a set
of data ,i plot the histogram and also want to see what distribution it
was.So i want to plot the curve to know what distribution it like.
To draw the curve and the distribution you should have an idea about the
distribution.
You cann't just draw the histogram and expect R to make a curve of the
best distribution to fit that histogram.
But you can plot a curve of a kernel density.
x <- rnorm(1000,5,3)
library(MASS)
(x.normfit <- fitdistr(x,"normal"))
hist(x,prob=TRUE)
lines(density(x,na.rm=TRUE),col="red") # kernel density
curve(dnorm(x,mean= x.normfit$estimate[1],sd=
x.normfit$estimate[2]),col="blue",add=TRUE) #maximum likelihood estimate
Rubén
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