Re: st: Outliers in correlation analysis

[Richard Williams <Richard.A.Williams.5@ND.edu>]

At 01:12 AM 12/31/2005, Siddharth Kharkar wrote:
> I have a very simple question.... I am trying to correlate two things using
> pearsons correlation, the results are non-significant due to one particular
> outlier (total number of observations = 36). If I exclude this outlier,
> there is a strong correlation between the other 35 patients (and this result
> makes biological sense)
This handout deals with some of the ways for dealing with outliers:

http://www.nd.edu/~rwilliam/stats2/l22.pdf

The first several pages deal with identifying the problem; discussion 
of solutions starts around p. 16.

Also good is Robert Yaffee's notes on Robust Regression Modeling with Stata:

http://www.nyu.edu/its/socsci/Docs/robust_reg3.pdf


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