Thank you Dave!
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of David Airey
Sent: Friday, April 17, 2009 4:04 PM
To: [email protected]
Subject: Re: st: Bland Altman Plots for Clustered Data
.
http://www.bepress.com/ijb/vol4/iss1/16/
is the reference I was thinking of.
-Dave
On Apr 17, 2009, at 1:56 PM, Ploutz-Snyder, Robert (JSC-SK)[USRA] wrote:
> Statalisters;
> In response to a reviewer's suggestion, I'm creating some Bland
> Altman plots (using concord.ado) on a panel dataset, where two
> parallel observations are made on subjects repeatedly over different
> speeds at a task. I'm doing this for a few outcomes, but have shown
> a 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 a
> pesky reviewer. My question is targeted to those of you who use or
> have an interested in the BA plots... Since my data are clustered
> on subject, what's the best approach to plot BA-like associations
> between means and diffs on the two outcomes? I'm trying to limit the
> number of BA plots, as the paper already has better plots showing
> the effects of speed (and other vars) on these two repeated
> observations. 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
>
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