Odp: basic boxplot questions
Hi r-help-bounces at r-project.org napsal dne 16.01.2009 15:24:26:
dear R experts: I am playing with boxplots for the first time. most of it is intuitive, although there was less info on the web than I had hoped. alas, for some odd reason, my R boxplots have some fat black dots, not just the hollow outlier plots. Is there a description of when R draws hollow vs. fat dots somewhere?
Standard use of boxplot does not draw filled dots, just hollow points. Didnt you by chance use pch=19.
[and what is the parameter to change just the size of these dots?]
Details on bxp help page outlty, outlwd, outpch, outcex, outcol, outbg: outlier line type, line width, point character, point size expansion, color, and background color. The default outlty= "blank" suppresses the lines and outpch=NA suppresses points.
Also, let me show my fundamental ignorance: I am a little surprised that the average box boxplot would not show the mean and sdv, too, at least optionally. Is there a common way to accomplish this (e.g., in a different color), or do I just construct it myself with standard R graphics line() commands?
I always expect boxplot to show median and IQR, however I have seen such twisted boxplots elsewhere. Eg if you looked in CRAN search facility you would easily find R-help archive January 2004: Re: [R] adding mean to boxplot Regards Petr
advice appreciated. regards, /iaw
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