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From |
David Airey <david.airey@Vanderbilt.Edu> |

To |
"statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu> |

Subject |
Re: st: Bland Altman Plots for Clustered Data |

Date |
Fri, 17 Apr 2009 14:00:51 -0500 |

Sent from my iPhone

Statalisters;In response to a reviewer's suggestion, I'm creating some BlandAltman plots (using concord.ado) on a panel dataset, where twoparallel observations are made on subjects repeatedly over differentspeeds at a task. I'm doing this for a few outcomes, but have showna sample below from the first 2 subjects:+---------------------------------------+ | subject speed rer0 rer1 | |---------------------------------------| 1. | 1 0 .9453608 .8185958 | 2. | 1 2 .7703036 .7761767 | 3. | 1 3 .7817145 .8262445 | 4. | 1 4 .8781749 .8886828 | 5. | 1 5 .9401777 1.012666 | 6. | 1 6 .9988574 1.080287 | |---------------------------------------| 7. | 2 0 .9489434 .8451807 | 8. | 2 2 .8366485 .7932663 | 9. | 2 3 .8556526 .8569991 | 10. | 2 4 .8677133 .8986406 | 11. | 2 5 .946165 .9572051 | 12. | 2 6 .9317179 .9195401 | |---------------------------------------|I don't normally use BA plots, but for now I'm trying to appease apesky reviewer. My question is targeted to those of you who use orhave an interested in the BA plots... Since my data are clusteredon subject, what's the best approach to plot BA-like associationsbetween means and diffs on the two outcomes? I'm trying to limit thenumber of BA plots, as the paper already has better plots showingthe effects of speed (and other vars) on these two repeatedobservations. But I have a reviewer who's really stuck on the BA plot.I'm starting with: concord rer0 rer1, loa(regline noref) But troubled by the clustering of observations within subject. Ideas? Rob * * 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/

* * 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/

**References**:**st: Bland Altman Plots for Clustered Data***From:*"Ploutz-Snyder, Robert (JSC-SK)[USRA]" <robert.ploutz-snyder-1@nasa.gov>

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