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From |
"JVerkuilen (Gmail)" <jvverkuilen@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Interpretation of Two-sample t test with equal variances? |

Date |
Wed, 20 Mar 2013 20:45:10 -0400 |

On Wed, Mar 20, 2013 at 7:50 PM, David Hoaglin <dchoaglin@gmail.com> wrote: > Jay, > > If the way people teach boxplots is the (main) source of the > difficulty, I would not be inclined to blame the boxplot! True. > I'm not sure what you mean by "the box ends up being too big" if the > data are light-tailed. I would expect the "whiskers" to be unusually > short. That was my way of saying that the whiskers were too short. > A boxplot can do only so much. The display was not designed to reveal > bimodal or multimodal data. A dotplot would usually show that > structure easily. Graphics, by their very nature, make assumptions about the data because they provide data reduction. The boxplot provides a lot of data reduction as it takes a variable from N observations down to 5 plus a few. So the boxplot's key assumption is that the data are unimodal. I guess I agree with Nick that they've been oversold, but as I say I use them. * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/

**References**:**st: Interpretation of Two-sample t test with equal variances?***From:*Gwinyai Masukume <parturitions@gmail.com>

**Re: st: Interpretation of Two-sample t test with equal variances?***From:*Richard Williams <richardwilliams.ndu@gmail.com>

**Re: st: Interpretation of Two-sample t test with equal variances?***From:*Gwinyai Masukume <parturitions@gmail.com>

**R: st: Interpretation of Two-sample t test with equal variances?***From:*"Carlo Lazzaro" <carlo.lazzaro@tiscalinet.it>

**Re: st: Interpretation of Two-sample t test with equal variances?***From:*Gwinyai Masukume <parturitions@gmail.com>

**Re: st: Interpretation of Two-sample t test with equal variances?***From:*David Hoaglin <dchoaglin@gmail.com>

**Re: st: Interpretation of Two-sample t test with equal variances?***From:*Nick Cox <njcoxstata@gmail.com>

**Re: st: Interpretation of Two-sample t test with equal variances?***From:*"JVerkuilen (Gmail)" <jvverkuilen@gmail.com>

**Re: st: Interpretation of Two-sample t test with equal variances?***From:*David Hoaglin <dchoaglin@gmail.com>

**Re: st: Interpretation of Two-sample t test with equal variances?***From:*"JVerkuilen (Gmail)" <jvverkuilen@gmail.com>

**Re: st: Interpretation of Two-sample t test with equal variances?***From:*David Hoaglin <dchoaglin@gmail.com>

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