plot probability density function (pdf)

[pigpigmeow]

I have 2 series of variables, I want to plot the probability density function of these 2 variabels (i.e. two curves in one graph), I just want to compare these two variable distribution.
what should I do?
can I use ggplot2 package?

[jdospina]

x=rnorm(100,1,0.8) # A series.
y=rnorm(100,0,0.5) # Another series with different mean and variance.

plot(density(x),ylim=c(0,1))
lines(density(y),col="red")

Remember that density() is a nonparametric estimator. You should properly choose the bandwith.

[pigpigmeow]

however, if i have an excel file, but there have 6 variables, a,b,c,d,e,f.


how to plot the probability density function of a and d in one graph, b and e in another graph?

[jdospina]

x11()
plot(density(a))
lines(density(d))
x11()
plot(density(b))
lines(density(e))

2011/10/12 pigpigmeow [via R] <[hidden email]>:

> however, if i have an excel file, but there have 6 variables, a,b,c,d,e,f.
>
>
> how to plot the probability density function of a and d in one graph, b and
> e in another graph?
>
>
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--
Juan David Ospina Arango

[pigpigmeow]

x11()
what does it mean?

if my data has missing value, can I plot the graph?
the missing data is shown "NA", how to handle it and plot pdf?

[pigpigmeow]

i want to plot probability density function,predictvalue has missing value and observevalue has not missing value, I tried ..

attach(test) #test is the name of the data file
names(test)

plot(density(predictvalue,na.rm=TRUE))
lines(density(observevalue))

is it correct?

[Michael Weylandt]

Assuming you mean you want them on the same device:

layout(1:2)
plot(density(a))
lines(density(d),col=2)
plot(density(b))
lines(density(e),col=2)

Getting your data into R is more of a challenge, but if you want my
unsolicited advice, you can do far worse than saving as CSV and using
read.csv()

Michael


On Wed, Oct 12, 2011 at 10:31 AM, pigpigmeow <[hidden email]> wrote:

> however, if i have an excel file, but there have 6 variables, a,b,c,d,e,f.
>
>
> how to plot the probability density function of a and d in one graph, b and
> e in another graph?
>
>
> --
> View this message in context: http://r.789695.n4.nabble.com/plot-probability-density-function-pdf-tp3897055p3898183.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
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> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>

______________________________________________
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https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
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[Bert Gunter]

Please -- this is not your personal help advisor. Use R's Help facilities
before posting.

-- Bert

On Wed, Oct 12, 2011 at 8:20 AM, pigpigmeow <[hidden email]> wrote:

> x11()
> what does it mean?
>

?x11

>
> if my data has missing value, can I plot the graph?
>

Try it and see.

>
> --
> View this message in context:
> http://r.789695.n4.nabble.com/plot-probability-density-function-pdf-tp3897055p3898362.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> [hidden email] mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>

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______________________________________________
[hidden email] mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

[pigpigmeow]

thank you all of u