A collection of some tests commonly used for identifying outliers:
- Chi-squared test for outlier
- Test for outlying or inlying variance
- Dixon tests for outlier
- Grubbs tests for one or two outliers in data sample
- Find value with largest difference from the mean
- Critical values and p-values for Cochran outlying variance test
- Critical values and p-values for Dixon test
- Calculate critical values and p-values for Grubbs test
- Interpolate tabularized distribution
- Remove the value(s) most differing from the mean
- Calculate scores of the sample
WWW: http://cran.r-project.org/web/packages/outliers/