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, just the body fatness 252nd case, each time recording the error. iv. Compute the standard deviation of the 252 errors to provide an estimate of body fatness the accuracy of the model. 14 Why is the resulting error estimate (the standard deviation in iv.) a better estimate of the true error that one should expect in using the model than the standard error? Discuss the advantages and disadvantages of this alternative cross-validation procedure compared to what Penrose, Nelson, and Fisher did. 15 In keeping with the other data analysis labs undertaken during the term, I body fatness serve as a resource/coach for student pairs during the class period in which they initially look at these data. After this class period the student pairs arrange to meet outside of class to continue their analysis and eventually write up their findings in a polished, word-processed report. Further details may be found in Egge, Foley, Haskins, and Johnson (1994, 1995). 4. Concluding Notes 16 My students have enjoyed working with this dataset and, upon hearing that I have a caliper and tables to estimate body fat from various skinfold measurements, come to me to borrow them!
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