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From |
Steve Samuels <sjsamuels@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Intraclass Correlation for an Independent Variable? |

Date |
Wed, 11 Aug 2010 17:05:48 -0400 |

The reviewer could well want to know if the plant differences in the X means are real. So, yes, he or she could really mean "X". This is the kind of question you'd test with a one-way ANOVA, or KW. You will need the data from the individual worker X measurements, or the plant-specific sample sizes and variances. Steve On Wed, Aug 11, 2010 at 4:36 PM, Lloyd Dumont <lloyddumont@yahoo.com> wrote: > Hello. I have gotten a confusing note from a reviewer, confusing in part because I think he/she is using the wrong terminology. > > > In a nutshell… > > I am running a cross-sectional time series model (on a dataset of plant-months) of a continuous variable Y measured at the plant level where the focal, continuous independent variable is X. X is also at the plant-level, but is time-constant. X is formed by taking the mean level of X from all of the individual workers in each plant. > > The reviewer suggests that I include some measure of within versus between plant variance in X. This would bolster the case that there is a genuine difference across plants rather than average differences simply reflecting noise. He/she then goes on to suggest I do this by reporting intraclass correlations (ICCs). > > As far as I understand it, ICCs (or rho) describe the variance in Y, not X. If I am right, then the reviewer did not mean ICC. > > Rather, he/she wants me to go back to the dataset of individuals (not plant-months) and wants me to run some simple analysis to show that there is clustering of values for X by clinic. > > Am I correctly understanding what the reviewer is asking for? And, if so, what is the simplest way to demonstrate the sort of dependence he/she is hoping to see? > > Thank you for your help. Lloyd > > > > > > > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/statalist/faq > * http://www.ats.ucla.edu/stat/stata/ > -- Steven Samuels sjsamuels@gmail.com 18 Cantine's Island Saugerties NY 12477 USA Voice: 845-246-0774 Fax: 206-202-4783 * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: Intraclass Correlation for an Independent Variable?***From:*Steve Samuels <sjsamuels@gmail.com>

**References**:**st: Intraclass Correlation for an Independent Variable?***From:*Lloyd Dumont <lloyddumont@yahoo.com>

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