The sum of rows (∑ R) is the total score for each subject over all five time periods, and Xsubjects at the right denotes the mean across time for each subject. SStotal = SStime + SSsubjects + SSerror. SSerror = SStotal − SStime − SSsubjects.
Relative risk (RR), also known as the risk ratio, is a ratio of proportions. In practice, the formal null hypothesis significance test is not typically performed on relative risk calculations; instead, confidence intervals are constructed about the calculated relative risk. This is simply the ratio of the number of subjects in the exposed group with a knee injury (cell A) divided by the total number of subjects in the exposed group (cell A + cell B), so that numerator for relative risk is A...
To resolve this issue, a statistical technique called factor analysis, which identifies the common components among multiple dependent variables and labels that component as a factor, has been developed. It removes the redundancy among the measured variables and produces a set of derived variables called factors. Computer programs that perform factor analysis list the original variables that group together into common derived factors.
In this instructor guide, written by William J. Vincent and Joseph P. Weir, you can find additional datasets, problems, and solutions like the ones found in the book. Depending on your browser and operating system, the process for downloading these files will vary. In most cases, clicking one of the following links will either open the file or download it to your computer.