You only have one response variable, so MANOVA is not appropriate. One option would be to compare BP ~ Weight + Height with BP ~ 1. That would give you a joint test of weight and height together. Since they are collinear, that should tell you the overall effect of "size". There are other options, most of which involve discarding some of the data. Frank Harrell's book is a font of wisdom on this sort of thing.
Harrell, F. E., Jr. (2001). Regression Modeling Strategies. Springer. Simon. On Thu, 2009-03-12 at 00:20 -0600, Ding Xiao wrote: > Hi All, > > I have questions about MANOVA which I am still not sure if appropriately I > should use it. > > For example I have a data set like this: > > BloodPressure (BP) Weight Height > 120 115 165 > 125 145 198 > 156 99 176 > > I know that BloodPressure is correlated with both Weight and Height, however > colinearity exists between Weight and Height. When I use BP = Weight + Height > as the model, one is got to be insignificant. I was trying to use a BP + > Weight = Height model, but not sure how to use it. > > Should I use MANOVA? or I just have to do two equations as BP = Weight & > Weight = Height > > Any suggestions and answers are greatly appreciated! > > Ding > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. -- Simon Blomberg, BSc (Hons), PhD, MAppStat. Lecturer and Consultant Statistician School of Biological Sciences The University of Queensland St. Lucia Queensland 4072 Australia Room 320 Goddard Building (8) T: +61 7 3365 2506 http://www.uq.edu.au/~uqsblomb email: S.Blomberg1_at_uq.edu.au Policies: 1. I will NOT analyse your data for you. 2. Your deadline is your problem. The combination of some data and an aching desire for an answer does not ensure that a reasonable answer can be extracted from a given body of data. - John Tukey. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
