[R] superimpose density line over hist

[Romain Francois]

Le 14.12.2005 11:54, Martin Maechler a écrit :

>>>>>>"Romain" == Romain Francois <francoisromain at free.fr>
>>>>>>    on Tue, 13 Dec 2005 15:40:59 +0100 writes:
>>>>>>            
>>>>>>
>
>	  ........
>
>    Romain> A few comments :
>    Romain> - your code should be reproductible, otherwise it is useless. (that 
>    Romain> recommandation is on the posting guide)
>
>    Romain> - that question is a top ten question on that list, go to the archive 
>    Romain> and you will find answers. (also posting guide)
>    Romain> BTW, it should be a FAQ and what about an example of overlaying in hist 
>    Romain> help page ?
>
>What about the following one --- do also note the comments though!
>  
>
Great !

>set.seed(14)
>x <- rchisq(100, df = 4)
>
>## Comparing data with a model distribution should be done with qqplot()!
>qqplot(x, qchisq(ppoints(x), df = 4)); abline(0,1, col = 2, lty = 2)
>
>## if you really insist on using hist() ... :
>hist(x, prob = TRUE, ylim = c(0, 0.2))
>curve(dchisq(x, df = 4), col = 2, lty = 2, lwd = 2, add = TRUE)
>
>  
>
I agree with you about qqplot, but a lot of people like that kind of 
hist-density overlay ...

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+---------------------------------------------------------------+
| Romain FRANCOIS - http://francoisromain.free.fr               |
| Doctorant INRIA Futurs / EDF                                  |
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