A Research Team Wanted to Assess the Relationship Between Age

question 40

Essay

A research team wanted to assess the relationship between age, systolic blood pressure, smoking, and risk of stroke. A sample of 150 patients who had a stroke is selected and the data collected are given below. Here, for the variable Smoker, 1 represents smokers and 0 represents nonsmokers.




Partition the data into training (50 percent), validation (30 percent), and test (20 percent) sets. Predict the Risk of stroke using k-nearest neighbors with up to k = 20. Use Risk as the output variable and all the other variables as input variables. In Step 2 of XLMiner's k-Nearest Neighbors Prediction procedure, be sure to Normalize input data and to Score on best k between 1 and specified value. Generate a Detailed Scoring report for all three sets of data.
a. What value of k minimizes the root mean squared error (RMSE) on the validation data?
b. What is the RMSE on the validation data and test data?
c. What is the average error on the validation data and test data? What does this suggest?

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Definitions:

Reasonable Duration

A length of time that is considered fair and appropriate under given circumstances or legal standards.

Physical Barriers

Obstacles that prevent or hinder movement or access, often relevant in discussions of accessibility and security.

Physical restraint

The use of physical force to limit a person's movements or actions, often for safety or control.

Probable Cause

A reasonable ground for belief, based on facts and circumstances, that a crime has been or is being committed, often used as justification for issuing a warrant.