[R] outlier threshold

[Uwe Ligges]

Melanie Vida wrote:

> For the analysis of financial data wih a large variance, what is the best way to select an outlier threshold? 
> 
> Listed below, is there a best method to select an outlier threshold and how does R calculate it?
> 
> In R, how do you find the outlier threshold through an interquartile range?
> In R, how do you find the outlier threshold using the hist command?
> In R, how do you find the outlier threshold with Chebyshev Inequality?
> In R, how do you find the outlier threshold with Kmeans? 
> 
> Also, is there a better way to select an outlier threshold not listed above?


This depends on your definition of an outlier and the model for your 
data - there is no "best" method in general. The "robust" folks have 
quite a lot of theory and methods ...

Uwe Ligges


> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html