Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
greg.snow at imail.org
(801) 408-8111
> -----Original Message-----
> From: r-help-bounces at r-project.org
> [mailto:r-help-bounces at r-project.org] On Behalf Of Antje
> Sent: Tuesday, February 05, 2008 1:22 AM
> To: r-help at stat.math.ethz.ch
> Subject: [R] two densities with same stepsize
>
> Hi there,
>
> I have two series of data. plotting the density function of
> both gives me an idea about the difference of the data. But I
> would like to quantify the difference I see.
>
> a <- rnorm(100)
> b <- rnorm(100)
>
> da <- density(a)
> db <- density(b)
>
> The problem is that da$x and db$x are different and so I have
> difficulties to compare them... Is there any way to force the
> density funtion to produce the values for the same x-steps?
> Or is there any other statistical approach I should use for
> comparing two density functions? I need to quantify how much
> the data-series differ (density function is rather complex in
> my case with skew and several maximas, so not easily to
> describe as a mathematical function.
> Sorry, I'm not that deep into statistics. Any comments /
> keywords on this is welcome...
>
> Antje
>
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