Book: STAT22nd edition

Modeling with Regression and ANOVA

Chapter: 4

ex04-08CtyHlth.csv file

I have confusion with question c? I have no idea what the question is saying.

Another question: How can I add a CSV file while asking a question to my tutor? Thank You.

Topic 4.3 Exercises: Cross-validation 4.8 County health: cross validation. In Example 1.7 on page 35 we see that transforming the response variable to v MDs was a helpful re-expression for predicting the number of physicians in counties with a linear model based on the number of hospitals. Im CtyHith a. Use the first 35 counties in the CountyHealth dataset as a training sample* to fit a model to predict TsqrtMDs based on Hospitals. Write down the equation of the least squares line. b. Compute predictions for the holdout sample (last 18 cases in the original file) and find the cross-validation correlation. c. Compute the shrinkage and comment on what it tells you about the effectiveness of this model