Overlay normal distribution curve on histogram

[mick.h...@gmail.com]

Hi,

I've got Deducer working (on one computer anyway) and getting my head around the plot builder. I'm trying to create histogram with a normal distribution curve superimposed, as per the attached pic.

Two questions:

a) How is it possible to achieve this via plot builder? (histogram is fine, but what elements/settings for the curve?)

b) Is it possible to filter the data used (e.g. I have a column of data, but I only what to plot the subset for one site)

Thanks

- Mick

[Ian Fellows]

So that is one of the more annoying things to do in ggplot. It is possible though using the stat_function element. The code created is:

ggplot() +

geom_histogram(aes(y = ..density..,x = mpg),data=mtcars) +

stat_function(aes(x = mpg),data=mtcars,fun = dnorm,args = list(mean=mean(mtcars$mpg),sd=sd(mtcars$mpg)))

for (b), the easiest thing to do is to subset before plotting using the Data -> subset dialog.

Best,

Ian

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[mick.h...@gmail.com]

Thankyou Ian,

I was so close :)

I had tried that form of input without joy, but after testing your example successfully, I realise that my data was to blame. I assume this is because it contained some NA values.

I haven't tried subset before, but this format seemed to work Data.sub1<-subset(Data, !is.na(x)).

Is that the correct usage to just assign those rows in 'Data' where variable 'x' is not 'NA' ?

Thanks

- Mick

[mick.h...@gmail.com]

It's working now. Thanks again

- Mick