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Residuals and outliers
Residuals and outliers

... pattern. Durbin-Watson test can be used to test for time effect. The Durbin-Watson statistic can be gotten in SPSS via Regression → Linear → Statistics → DurbinWatson. Values of the statistic larger than 2.5 or less than 1.5 are indicative of a time effect. Outliers As in simple regression, outliers ...
Robust statistics: a method of coping with outliers
Robust statistics: a method of coping with outliers

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Robust statistics

Robust statistics are statistics with good performance for data drawn from a wide range of probability distributions, especially for distributions that are not normal. Robust statistical methods have been developed for many common problems, such as estimating location, scale and regression parameters. One motivation is to produce statistical methods that are not unduly affected by outliers. Another motivation is to provide methods with good performance when there are small departures from parametric distributions. For example, robust methods work well for mixtures of two normal distributions with different standard-deviations; under this model, non-robust methods like a t-test work badly.
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