boxplot - how are outliers determined?
in [Matlab]
|
Prev: www.cnnikebrand.com wholesale Nike Sneakers,jordans sneaker
Next: How to execute Mike Flood in Matlab?
From: MZ on 25 May 2010 15:24 The help file says that outliers are not included in the whisker of the boxplot function. I'd like to know what constitutes "outliers". Thanks.
From: Richard Willey on 25 May 2010 16:31 The following is taken from the help section describing the "whisker" parameter: Maximum whisker length w. The default is a w of 1.5. Points are drawn as outliers if they are larger than q3 + w(q3 - q1) or smaller than q1 - w(q3 - q1), where q1 and q3 are the 25th and 75th percentiles, respectively. The default of 1.5 corresponds to approximately +/-2.7? and 99.3 coverage if the data are normally distributed. The plotted whisker extends to the adjacent value, which is the most extreme data value that is not an outlier. Set whisker to 0 to give no whiskers and to make every point outside of q1 and q3 an outlier. "MZ" <mark(a)nospam.void> wrote in message news:rZOdnSqfva50vmHWnZ2dnUVZ_oWdnZ2d(a)giganews.com... > The help file says that outliers are not included in the whisker of the > boxplot function. I'd like to know what constitutes "outliers". Thanks.
From: Tom Lane on 25 May 2010 16:32
> The help file says that outliers are not included in the whisker of the > boxplot function. I'd like to know what constitutes "outliers". Thanks. Take another look at "help boxplot" and look at the description of the 'whisker' parameter. I think that's the information you want. -- Tom |