[R] 2 D density plot interpretation and manipulating the data

Ana Marija
Thu, 08 Oct 2020 20:52:12 -0000

Hello,

I have a data frame like this:

> head(SNP)
               mean      var     sd
FQC.10090295 0.0327 0.002678 0.0517
FQC.10119363 0.0220 0.000978 0.0313
FQC.10132112 0.0275 0.002088 0.0457
FQC.10201128 0.0169 0.000289 0.0170
FQC.10208432 0.0443 0.004081 0.0639
FQC.10218466 0.0116 0.000131 0.0115
...

and I am creating plot like this:

s <- ggplot(SNP, mapping = aes(x = mean, y = var))
s <- s +  geom_density_2d() + geom_point() + my.theme +
ggtitle("SNPs")
s

I am getting plot in attach.

My question is how do I:
1.interpret the inclusion versus exclusion within the ellipses-contours?

2. how do I extract from my data frame the points which are outside of ellipses?

Thanks
Ana

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