posted to sci.stat.edu and e-mailed. On 3 Jun 2003 19:55:25 -0700, [EMAIL PROTECTED] (Serge) wrote:
> Hello, > > Thanks for all the help. Donald Burrill mentioned that I should > show that r=0.6 is statistically significant vs r=0. I don't think I > have ever seen that done so can anyone please elaborate on how I can > go about doing that. How do I find the test statistic for such a > significance test? Thanks for your help. > As for grouping, I decided to try to separate the cars out by > origin (imported or domestic). Then I can use a significance test to > show if one type is safer than the other for each of the 4 crash test > ratings. I'm also probably gonna carry out that weight grouping > procedure because I am interested in where it will lead me (I will > definately post the results). Here is what I'll do => I have 9 groups > as follows: I'm not excited enough about the research to dig through the site, but I'm still curious - since you haven't mentioned it, and it is not obvious to me - What do the folks at the site have in mind when they say, as I posted yesterday, "Keep in mind that crash test results shouldn't be compared among vehicles with large weight differences (more than 15%), so we have divided the vehicles into 5 distinct weight categories. " As I say, I just spend a few minutes there. Are you using some other data? Am I wrong in thinking that this should be a serious warning? -- Rich Ulrich, [EMAIL PROTECTED] http://www.pitt.edu/~wpilib/index.html . . ================================================================= Instructions for joining and leaving this list, remarks about the problem of INAPPROPRIATE MESSAGES, and archives are available at: . http://jse.stat.ncsu.edu/ . =================================================================
