### could someone help me with this intro to stat. problem

5 of 10 volunteers are randomly selected to receive self-defense training. The other 5 receive no training. At the end of the training period, all subjects complete a self-confidence questionnaire. a.) Is there a difference in self-confidence between the 2 groups (p.01)? b.) What are the

### Re: Disadvantage of Non-parametric vs. Parametric Test

- I have a comment on an offhand remark of Glen's, at the start of his interesting posting - On Tue, 07 Dec 1999 15:58:11 +1100, Glen Barnett [EMAIL PROTECTED] wrote: Alex Yu wrote: Disadvantages of non-parametric tests: Losing precision: Edgington (1995) asserted that when more

### Re: Coefficient of Determination Question

I believe I've heard (1-r^2) called the "coefficient of alienation," but I can't think of any references... Gaurang Mehta wrote: I am looking for the coefficient name for (1-r^2). I know r^2 is the Coefficient of Determination, but I do not know the name of the (1-r^2) coefficient. Any

### Re: Coefficient of Determination Question

I suspect most readers (including myself) would prefer the more simple and clear terms "explained variance" and "unexplained variance." I suggest leaving the term alienation to Karl Marx's Political-Economy. Burke Johnson

### Re: Sample Distribution

Mark ( [EMAIL PROTECTED]) write: I have a problem that puzzles me. It's a theorem that is listed in an inference book. Here it is: If a random sample with size two is taken from a distribution with positive variance and if the sum and the difference of the two components of that sample

### Re: could someone help me with this intro to stat. problem

On 8 Dec 1999, Luv 2 muah 143 wrote: 5 of 10 volunteers are randomly selected to receive self-defense training. The other 5 receive no training. At the end of the training period, all subjects complete a self-confidence questionnaire. a.) Is there a difference in self-confidence

### FW: could someone help me with this intro to stat. problem

Mike, With randomization pre, it is not necessary to take a pre-intervention measurement. Test the difference in confidence following the training. If it is significant, there is a difference. Decide what direction it is in and attribute the difference to the training. You can make this

### Re: Disadvantage of Non-parametric vs. Parametric Test

Frank E Harrell Jr wrote: Alex Yu wrote: Disadvantages of non-parametric tests: Losing precision: Edgington (1995) asserted that when more precise measurements are available, it is unwise to degrade the precision by transforming the measurements into ranked data.

### Re: Disadvantage of Non-parametric vs. Parametric Test

Rich Ulrich wrote: - In my vocabulary, these days, "nonparametric" starts out with data being ranked, or otherwise being placed into categories -- it is the infinite parameters involved in that sort of non-reversible re-scoring which earns the label, nonparametric. (I am still trying to