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From |
"Lachenbruch, Peter" <Peter.Lachenbruch@oregonstate.edu> |

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

Subject |
st: RE: Re: z-score diff plots |

Date |
Thu, 11 Apr 2013 17:25:53 +0000 |

sounds like there might be two approaches here: ignore the covariate and do a regression do the regression with the covariate fixed at the mean value in the first group (or even get the values) and compare the intercepts. Probably should use an interaction of group and coavariate Peter A. Lachenbruch, Professor (retired) ________________________________________ From: owner-statalist@hsphsun2.harvard.edu [owner-statalist@hsphsun2.harvard.edu] on behalf of Joseph Coveney [stajc2@gmail.com] Sent: Wednesday, April 10, 2013 7:40 PM To: statalist@hsphsun2.harvard.edu Subject: st: Re: z-score diff plots Nikos Kakouros wrote: I'd like to first apologize upfront for the lack of specificity in my question - please be sensitive to my lack of experience with Stata. :) I have two tests that are meant to measure the same thing (blood thickness) but with totally different units. On the whole they correlate well (patients with thick blood have higher values on both measurements), but the first test is affected (on univariate analysis) by another blood parameter but the second test is not. Their correlation is, therefore, dependent on the third parameter. I would appreciate on comments/advice on how to best visually show this relationship in Stata. I was thinking the following: convert all measurements to z-scores and depict the difference in z-score for the two measurements at different values (y axis) vs the value of the third variable that affects one of the tests more than the other (x-axis). Is anyone familiar with such a visualization? -------------------------------------------------------------------------------- I'm not familiar with it. Would a scatterplot matrix (SPLOM) help? (See -help graph matrix-.) Joseph Coveney * * 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/ * * 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/

**Follow-Ups**:**Re: st: RE: Re: z-score diff plots***From:*Nikos Kakouros <nkakouros@gmail.com>

**References**:**st: z-score diff plots***From:*Nikos Kakouros <nkakouros@gmail.com>

**st: Re: z-score diff plots***From:*"Joseph Coveney" <stajc2@gmail.com>

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